阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。

People who averaged fewer than seven hours of sleep per night in the weeks before being exposed to the cold virus were nearly three times as likely to get sick as those who averaged eight hours or more, a new study found.

Researchers used frequent telephone interviews to track the sleep habits of more than 150 men and women aged 21 to 55 over the last few weeks.Then they exposed the subjects to the virus, quarantined(检疫隔离)them for five days and kept track of who got sick.

Besides sleeping more, sleeping better also seemed to help the body fight illness: Patients who fared better on a measure known as “sleep efficiency”—the percentage of time in bed that you’re actually sleeping—were also less likely to get sick.

The results held true even after researchers adjusted for elements such as body-mass index, age, sex, smoking and pre-existing antibodies(抗体)to the virus.

The researchers aren’t exactly sure why sleeping better makes you less likely to develop a cold.But they do try to give an answer: “Sleep disturbance influences the regulation of symptom mediators(调节因子)that are released in response to infection.” In plain English, maybe tossing and turning when you’re infected with the cold virus contributes to the symptoms that define a cold.

The researchers were based at Carnegie Mellon, the University of Pittsburgh and the University of Virginia, and the study was funded by the National Institutes of Health.

1.According to the passage, what does the underlined word “subjects” mean in paragraph 2?

A.areas of knowledge in a school

B.people being studied in an experiment

C.research topics

D.animals being tested

2.It is shown in the passage that _______.

A.the researchers obtain information about the sleep habits by frequent interviews

B.the researchers do their research in the National Institutes of Health

C.people hope to avoid being infected with a cold by sleeping as much as possible

D.sleeping more and better helps regulate the symptom mediators

3.What’s the best title of the passage?

A.The Relationship Between Virus and Cold

B.How to Sleep Well

C.Good Sleep Helps Fight a Cold

D.The More the Sleep, the Better Your Body

Once there was a huge apple tree.A little boy loved to come and play around it every day.He loved the tree and the tree loved to play with him.

Time went by…the little boy had grown up and he no longer played around the tree every day.One day, the boy came back to the tree and he looked sad.“Come and play with me,” the tree asked the boy.“I’m no longer a kid.I wouldn’t play around the tree any more.” the boy replied.“I want toys.I need money to buy them.” “Sorry, I don’t have money.But you can pick all my apples and sell them.So, you will have money.” The boy picked all the apples on the tree and left happily.The boy never came back after he picked the apples.

One day, the boy returned and the tree was so excited, “Come and play with me,” the tree said.“I don’t have time to play.I have to work for my family.We need a house for shelter.Can you help?” “Sorry, I don’t have a house.But you can cut off my branches to build your house.” So the boy cut all the branches off the tree and left happily.The tree was glad to see him happy but the boy never came back since then.The tree was again lonely and sad.

One hot summer day, the boy returned and the tree was pleased.“Come and play with me!” the tree said.“I am sad and getting old.I want to go sailing to relax myself.Can you give me a boat?” “Use my trunk to build your boat.You can sail far away and be happy.” So the boy cut the tree trunk to make a boat.He went sailing and never showed up for a long time.

Finally, the boy returned after he left for so many years.“Sorry, my boy.But I don’t have anything for you any more.The only thing left is my dying root,” the tree said with tears ①.

“Good! Old tree root is the best place to lean on and rest.Come and sit down with me and rest.” The boy sat down and the tree was glad and smiled with tears ② …

1.----Why did the boy pick all the apples on the tree?

----Because __________.

A.he wanted to eat them

B.he needed money to buy toys

C.he liked the tree without apples

D.he wanted to share them with friends

2.----When did the boy come back to the apple tree?

----He came back _________.

A.whenever he was happy

B.if he missed the apple tree

C.when he was in times of difficulty

D.as soon as he was free

3.----What did the boy want at last?

----He wanted ___________.

A.to have a house to live in

B.nothing except a place to rest

C.the root of the apple tree

D.anything that the apple tree had

4.----What can we learn from the story?

----We should _________.

A.plant more apple trees

B.learn from the boy

C.always stay at home

D.be thankful to our parents

5.According to the passage, which of the following statements is NOT true?

A.The phrase “with tears ①” means that the apple tree was sad because the boy asked for too much.

B.The phrase “with tears ②” means that the apple tree was still happy because she could help the boy for the last time.

C.Each time the boy asked the apple tree for help, the tree tried her best to satisfy him.

D.After reading the passage, we can easily think of the old Chinese saying “Parents’ love is universal!”

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