The radiation amount of a mobile phone for two half-hour periods per day is equal to to an X-ray for ten seconds. A. expose B. exposing C. exposed D. being exposed 题目和参考答案——青夏教育精英家教网—

题目内容

The radiation amount of a mobile phone for two half-hour periods per day is equal to ___ to an X-ray for ten seconds.

A. expose B. exposing C. exposed D. being exposed

练习册系列答案

课课练与单元测试系列答案

世纪金榜小博士单元期末一卷通系列答案

单元测试AB卷台海出版社系列答案

黄冈新思维培优考王单元加期末卷系列答案

相关题目

三、用方框内所给词语的适当形式填空。(共10小题；每小题1分，满分10分)

be filled with go off pull through depend on suffer from

on one’s own be up to take up at the moment carry on

1．Don’t talk loudly because he is busy doing homework_________.

2．Those old books ________________ too much room, but I don’t know what to do with them.

3. Although it was noisy outside, he __________ playing the piano.

4．After the accident，Christopher Reeve was not expected to _______,but he made it．

5．Mike often__________ a bad cold.

6．We have solved the problems_________.

7．—What ______ you_____ this weekend?

—Don’t ask，Tom．I have lots of work to do．

8．The living cost you pay ________ where you live.

9．The alarm clock suddenly ____________ and he jumped out of his bed at once.

10. As a housewife, my days _____________ cooking and cleaning.

Mike had to walk home his bike stolen.

A. with B. as C. for D. since

第二节（共5小题，每小题2分，满分10分）

根据短文内容，从下框的A—F选项中选出能概括每一段主题的最佳选项。选项中有一项为多余选项。

A. Environment protection

B. Driving experience

C. Self – driving

D. Safety

E. Computing and communications

F. Wireless communications

Since the gene, called DAF-16 in worms, was found in many animals and in humans, the finding could open up new ways to affect aging, immunity(免疫)and resistance in humans, the scientists said.?

“We wanted to find out how normal aging is being governed by genes and what effect these genes have on other traits, such as immunity,” said Robin May of the University of Birmingham, who led the study.?

Populations across the world are aging at a surprising pace, bringing potentially big challenges for health and social care systems. A study by Danish scientists last year found that half of babies born in the rich world today will live to celebrate their 100th birthdays. Scientists are eager to find out how people age to try to develop drugs to help them stay healthier as their lives extend.?

“What we have found is that things like resistance and aging tend to go hand in hand,” May said in an interview.?

May’s team compared longevity, stress resistance and immunity in four related species of worm. They also looked for differences in the activity of DAF-16 in each of the four species, and found that they were all quite distinct.?

May said DAF-16 was active in most cells in the body and was very similar to a group of human genes called FOXO genes, which scientists believe play a role in the aging process.?

“The fact that subtle（微妙的）differences in DAF-16 between species seem to have such an impact on aging and health is very interesting and may explain how differences in lifespan and related traits have arisen during evolution,” May said.?

67. In which section may the text appear in a newspaper? ?

A. Education. B. Science. C. Entertainment. D. Culture.

68. What can we know from the third paragraph??

A. New ways have been found to affect aging. ? B. Babies in the rich world will all live longer. ?

C. Present social care systems are poorly managed.? D. Aging populations are causing more challenges.

69. From the text we know that DAF-16_____.?

A. is a gene that is only found in worms? B. can make people live longer?

C. has an effect on aging and immunity? D. has been quite familiar to scientists

70. What can be the best title of the passage??

A. Scientists Find Gene Linked to Aging? B. Population Aging Faster than Expected?

C. How to Make People Live Longer? D. Gene Determines How Long We Live?

Barack Obama, who came into _________ power on January 20, 2009, was awarded _________2009 Nobel Peace Prize.

A. the; the B. the; / C. /; the D. /; /

Weekend one-day out

A walk along the Great Wall

Beijing Hikers is organizing a hike in a village along the Great Wall in Changping District, north of downtown Beijing. The walk will take around three hours covering a distance of 10 kilometers.

Time: 8:30 a. m. ~ 4:30 p. m, Dec. 4

Cost: 200 yuan (US $ 25) per adult, 150 yuan (US $ 18. 50) for under-12s.

Meeting place: 8:30 a. m. in front of Starbucks at Lido Holiday Inn, Jiangtai Lu.

To sigh-up (one day before the hike) and more information, contact Huijie at 139 1002 5516.

Skiing and hot springs

Cycle China plans a day’s skiing fun at a resort around Beijing followed by an outdoor hot spring bath for your sore(酸痛的) body.

Cost: 350 yuan (US $ 43. 40)

Time: 8:30 a. m ~ 6:30p. m, Dec. 4

Location: Meet at the office of Cycle China, opposite the east gate of Jingshan Park, Xicheng District.

For more information and reservation, email reserve @ cyclechina. com or call 139 1188 6524.

Horse riding

This is a trip to a professional horse-riding club with well-trained bilingual instructors, offering lessons to people who love riding and those willing to learn more. The club is located in Hebei Province next to the Kangxi Grassland.

Time: 1:30a. m~ 4:30p. m, Dec. 4

Cost: 330 yuan (US$40. 74) including one hour’s riding, transportation, guide, lunch.

To sigh-up and more information, contact Lucy at 8580 5080 or 130 1117 1326.

68. This passage is written mainly for ________.

A. travel agencies B. holiday-makers C. guides D. sportsmen

69. If Mary, who is ten years old, wants to hike along the Great Wall with her parents, they will pay_____ dollars.

A. 400 B. 450 C. 68. 50 D. 65

70. If you are interested in the knowledge about horse-riding, you’ll contact_________.

A. 139 1188 6515 B. 139 1188 6524 C. 130 1117 1326 D. 139 1002 5516

71. Cycle China is ________.

A. a website which offers travelling information B. a traveling agency

C. a trainer for skiing D. a resort which offers hot spring bath

In peace, too，the Red Cross is expected to send help___________ there is human suffering.

A. whoever B. wherever C. whatever D. however

The massive 8.8 quake, the seventh strongest in recorded history, hit Chile and should have shortened the length of an Earth day by 1.26 milliseconds, More impressive is how much the quake shifted the Earth’s axis（地轴）.

The computer mode! Used to determine the effects of the Chile earthquake effect also found that it should have moved the Earth’s figure axis by about 8 cm. The Earth’s figure figure axis is not the same as its north-south axis, which Earth turns around once every day at a speed of about 1,604 kph. The figure axis is the axis around which the Earth’s mass is balanced. It is offset（偏离） from the Earth’s north-south axis by about 10 meters.

Strong earthquakes can change Earth’s days and its axis. The 9.1 Sumatran earthquake in 2004, which set off a deadly tsunami（海啸），should have shortened Earth’s days by 0.0068 milliseconds and shifted its axis by about 7cm.

One Earth day is about 24 hours long. Over the course of a year, the length of a day normally changes gradually by one millisecond, It increases in the winter when Earth more slowly, and decreases in the summer.

The Chile earthquake was much smaller than the Sumatran quake, but its effects on the Earth are larger because of its location. The fault（断层） responsible for the 2010 Chile quake also cuts through Earth at a larger angle that the Sumatran quake’s fault. This makes the Chile fault ore effective in moving the Earth’s mass vertically and hence more effective in shifting the Earth’s figure axis.

The findings are based on early date available on the Chile earthquake. The Chile earthquake has killed more than 700 people and cause widespread damage in the South American country.

64．What’s the biggest problem caused by the Chile quake?

A．It is the seventh strongest in recorded history. B．It should have shortened the length of an Earth day.

C．It shifted the Earth’s axis. D．It made the day longer on Earth.

65．Comparing the Sumatram earthquake with the Chile earthquake, we know that .

A．the Sumatram earthquake had more effect on Earth

B．the location of the Chile earthquake is responsible for its larger effects on Earth.

C．the Sumatram earthquake was less destructive

D．the Chile earthquake fault changed the Earth’s mass

66．What does the word “it” in the 4th paragraph refer to?

A．The length of a day. B．The axis. C．One millisecond. D．The change of the day.

试题分类