he was chosen made us very happy.A.BecauseB.WhatC.ThatD.Whether 题目和参考答案——青夏教育精英家教网—

A new study says one part of the human brain may become smaller as the result of a condition known as jet lag. Jet lag results from flying long distances in an airplane. Jet lag interferes with a person's normal times for sleeping and waking. People with jet lag may feel extremely tired for several days. They also may have problems thinking clearly and remembering.

Kwangwook Cho is a researcher at the University of Bristol in Britain. He reported the findings of his jet lag study in the publication Nature Neuroscience.

The study involved twenty young women who worked for international airlines. The women had served passengers on airplanes for five years. These flight attendants flew across many countries and at least seven time zones. In the study, the flight attendants had different amounts of time to recover from jet lag. Half the women spent five days or fewer in their home areas between long flights. The other half spent more than fourteen days in their home areas.

Mister Cho took some fluid from the women's mouths to measure levels of a hormone that increases during stress. He tested them to see if they could remember where black spots appeared on a computer screen. And he took pictures of their brains using magnetic resonance imaging. This is a way to measure the size of the brain's temporal lobes.

It was found that the women who had less time between flights had smaller right temporal lobes. This area of the brain deals with recognizing and remembering what is seen. The same group performed worse and had slower reaction times on the visual memory test. And their saliva samples showed higher levels of stress hormones.

Mister Cho says he believes the brain needs at least ten days to recover after a long trip. He says airline workers told him their ability to remember got worse after working on planes for about four years. Other studies have shown that increased feelings of stress can cause a loss of cells in the part of the brain that controls memory.

Scientists say more tests are needed to study the effects of jet lag on the brain. They want to find out if too much jet lag could permanently affect memory.

1.According to the text, jet lag _____.

A. can cause difficulties in speaking

B. can make people feel tired for a few weeks

C. is the illness only found in people who work on the airplanes

D. can be caused by flying over several time zones in an airplane

2.It is inferred that more tests need to be done because _____.

A. the conclusion was questioned by many scientists

B. scientists fear that his research is not done properly

C. every scientific conclusion needs the support from many tests

D. the woman who were studied in the research were not healthy

3.What is the subject discussed in the test?

A. The cause of jet lag.

B. A story of a group of flight attendance.

C. A research about the effects of jet lag on the brain.

D. The importance of having enough rest after long flights.

A new study says one part of the human brain may become smaller as the result of a condition known as jet lag. Jet lag results from flying long distances in an airplane. Jet lag interferes with a person's normal times for sleeping and waking. People with jet lag may feel extremely tired for several days. They also may have problems thinking clearly and remembering.

Kwangwook Cho is a researcher at the University of Bristol in Britain. He reported the findings of his jet lag study in the publication Nature Neuroscience.

The study involved twenty young women who worked for international airlines. The women had served passengers on airplanes for five years. These flight attendants flew across many countries and at least seven time zones. In the study, the flight attendants had different amounts of time to recover from jet lag. Half the women spent five days or fewer in their home areas between long flights. The other half spent more than fourteen days in their home areas.

Mister Cho took some fluid from the women's mouths to measure levels of a hormone that increases during stress. He tested them to see if they could remember where black spots appeared on a computer screen. And he took pictures of their brains using magnetic resonance imaging. This is a way to measure the size of the brain's temporal lobes（颞叶）.

It was found that the women who had less time between flights had smaller right temporal lobes. This area of the brain deals with recognizing and remembering what is seen. The same group performed worse and had slower reaction times on the visual memory test. And their saliva samples showed higher levels of stress hormones.

Mister Cho says he believes the brain needs at least ten days to recover after a long trip. He says airline workers told him their ability to remember got worse after working on planes for about four years. Other studies have shown that increased feelings of stress can cause a loss of cells in the part of the brain that controls memory.

Scientists say more tests are needed to study the effects of jet lag on the brain. They want to find out if too much jet lag could permanently affect memory.

1.According to the text, jet lag _____.

A. can cause difficulties in speaking

B. can make people feel tired for a few weeks

C. is the illness only found in people who work on the airplanes

D. can be caused by flying over several time zones in an airplane

2.It is inferred that more tests need to be done because _____.

A. the conclusion was questioned by many scientists

B. scientists fear that his research is not done properly

C. every scientific conclusion needs the support from many tests

D. the woman who were studied in the research were not healthy

3.Which of the following statements is TRUE about the research results?

A. Women who have a longer rest at home show better memory.

B. Women who fly in short time had smaller right temporal lobes.

C. Women who have longer flights failed the memory test.

D. Women who rest more than 14 days produced less hormones.

4.What is the subject discussed in the test?

A. The cause of jet lag.

B. A story of a group of flight attendance.

C. A research about the effects of jet lag on the brain.

D. The importance of having enough rest after long flights.

A new study says one part of the human brain may become smaller as the result of a condition known as jet lag. Jet lag results from flying long distances in an airplane. Jet lag interferes with a person's normal times for sleeping and waking. People with jet lag may feel extremely tired for several days. They also may have problems thinking clearly and remembering.

Kwangwook Cho is a researcher at the University of Bristol in Britain. He reported the findings of his jet lag study in the publication Nature Neuroscience.

The study involved twenty young women who worked for international airlines. The women had served passengers on airplanes for five years. These flight attendants flew across many countries and at least seven time zones. In the study, the flight attendants had different amounts of time to recover from jet lag. Half the women spent five days or fewer in their home areas between long flights. The other half spent more than fourteen days in their home areas.

Mister Cho took some fluid from the women's mouths to measure levels of a hormone that increases during stress. He tested them to see if they could remember where black spots appeared on a computer screen. And he took pictures of their brains using magnetic resonance imaging. This is a way to measure the size of the brain's temporal lobes（颞叶）.

It was found that the women who had less time between flights had smaller right temporal lobes. This area of the brain deals with recognizing and remembering what is seen. The same group performed worse and had slower reaction times on the visual memory test. And their saliva samples showed higher levels of stress hormones.

Mister Cho says he believes the brain needs at least ten days to recover after a long trip. He says airline workers told him their ability to remember got worse after working on planes for about four years. Other studies have shown that increased feelings of stress can cause a loss of cells in the part of the brain that controls memory.

Scientists say more tests are needed to study the effects of jet lag on the brain. They want to find out if too much jet lag could permanently affect memory.

72. According to the text, jet lag _____.

A. can cause difficulties in speaking

B. can make people feel tired for a few weeks

C. is the illness only found in people who work on the airplanes

D. can be caused by flying over several time zones in an airplane

73. It is inferred that more tests need to be done because _____.

A. the conclusion was questioned by many scientists

B. scientists fear that his research is not done properly

C. every scientific conclusion needs the support from many tests

D. the woman who were studied in the research were not healthy

74. Which of the following statements is TRUE about the research results?

A. Women who have a longer rest at home show better memory.

B. Women who fly in short time had smaller right temporal lobes.

C. Women who have longer flights failed the memory test.

D. Women who rest more than 14 days produced less hormones.

75. What is the subject discussed in the test?

A. The cause of jet lag.

B. A story of a group of flight attendance.

C. A research about the effects of jet lag on the brain.

D. The importance of having enough rest after long flights.

April 16,2007—A Bloody Day

Brave professor takes the bullets（子弹）meant for his class

Liviu Librescu, 76, a senior researcher and lecturer in engineering, was a Holocaust（大屠杀）survivor who immigrated to Israel from Romania in 1978. Librescu was an expert in mechanics, teaching at Tel Aviv University and the Haifa Tchnion before moving to the United States in 1984.

According to eyewitness accounts, Librescu and the class heard shooting in a nearby room. The students said their professor blocked the doorway with his body to stop the gunman from entering. Some students took cover underneath desks while others jumped out of windows.

Librescu’s son Joe said to the news reporter：“I understand from friends that my father was a hero.”

“It wouldn’t amaze me he would do such a thing,” fellow engineering professor Muhammad said “He is that kind of person, willing to take care of others and protect others.”

Depressed young man shoots 32 people to death before killing himself

A student from South Korea was identified on Tuesday as the gunman who killed 32 people at Virginia Tech University in the deadliest shooting in modern US history.

The shooter, 23-year-old Cho Seung-Hui, who immigrated to the United States 15 years ago and was raised near Washington, killed himself after opening fire in four classrooms.

Cho was described as a depressed and deeply disturbed young man whose “grotesque”（怪诞）creative play writings even led a professor to advise him to see a psychological doctor.

The police had found a scrawl（涂鸦）in Cho’s dorm room. “It’s sort of a writing attacking the rich, spoiled students.” “A second note was found near Cho’s body, also containing the same kind of thing.” It could not immediately be determined when the notes were written.

Fellow students in a playwriting class with Cho also noticed the dark and disturbing nature of his compositions. “His writing, the plays, were full of hatred and seemed very angry,” Stephanie Derry, a senior English major said, “I remember one of them very well. It was about a son who hammered his stepfather to death.” Derry said.

“He wasn’t an outgoing kind of person. He was very quiet and always kept to himself,” Cho’s neighbor Shash recalled, “He spent a lot of his free time playing basketball and would not respond if someone greeted him.”

Rod Wells, a postal worker, said that characterization of Cho did not fit his parents, who worked at a dry cleaner’s. He described them as “always polite, always kind to me, very quiet, always smiling. Just sweet people.”

1．This passage is a piece of news on .

A．current events B．social activities

C．house accidents D．academic careers

2．Librescu bravely blocked the doorway because .

A．he had survived the Holocaust B．he had a strong sense of social duty

C．he was an extraordinary hero D．he had a quick response in danger

3．Which of the following is NOT a word for Cho?

A．Cold-blooded. B．Self-centered.

C．Bad-tempered. D．Dark-natured.

4．Which of the following is true?

A．A certain professor noticed Cho’s abnormal personality.

B．Cho was born into a rich family so he hated spoiled children

C．Cho wrote many disturbing novels concerning bloody killings

D．Cho hammered his stepfather to death before killing himself.

A new study says one part of the human brain may become smaller as the result of a condition known as jet lag. Jet lag results from flying long distances in an airplane. Jet lag interferes with a person's normal times for sleeping and waking. People with jet lag may feel extremely tired for several days. They also may have problems thinking clearly and remembering.

Kwangwook Cho is a researcher at the University of Bristol in Britain. He reported the findings of his jet lag study in the publication Nature Neuroscience.

The study involved twenty young women who worked for international airlines. The women had served passengers on airplanes for five years. These flight attendants flew across many countries and at least seven time zones. In the study, the flight attendants had different amounts of time to recover from jet lag. Half the women spent five days or fewer in their home areas between long flights. The other half spent more than fourteen days in their home areas.

Mister Cho took some fluid from the women's mouths to measure levels of a hormone that increases during stress. He tested them to see if they could remember where black spots appeared on a computer screen. And he took pictures of their brains using magnetic resonance imaging. This is a way to measure the size of the brain's temporal lobes（颞叶）.

It was found that the women who had less time between flights had smaller right temporal lobes. This area of the brain deals with recognizing and remembering what is seen. The same group performed worse and had slower reaction times on the visual memory test. And their saliva samples showed higher levels of stress hormones.

Mister Cho says he believes the brain needs at least ten days to recover after a long trip. He says airline workers told him their ability to remember got worse after working on planes for about four years. Other studies have shown that increased feelings of stress can cause a loss of cells in the part of the brain that controls memory.

Scientists say more tests are needed to study the effects of jet lag on the brain. They want to find out if too much jet lag could permanently affect memory.

72. According to the text, jet lag _____.

A. can cause difficulties in speaking

B. can make people feel tired for a few weeks

C. is the illness only found in people who work on the airplanes

D. can be caused by flying over several time zones in an airplane

73. It is inferred that more tests need to be done because _____.

A. the conclusion was questioned by many scientists

B. scientists fear that his research is not done properly

C. every scientific conclusion needs the support from many tests

D. the woman who were studied in the research were not healthy

74. Which of the following statements is TRUE about the research results?

A. Women who have a longer rest at home show better memory.

B. Women who fly in short time had smaller right temporal lobes.

C. Women who have longer flights failed the memory test.

D. Women who rest more than 14 days produced less hormones.

75. What is the subject discussed in the test?

A. The cause of jet lag.

B. A story of a group of flight attendance.

C. A research about the effects of jet lag on the brain.

D. The importance of having enough rest after long flights.

________ he was chosen made us very happy.

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