Do that again I`ll call a policeman. A. but B. and C. or D. so 题目和参考答案——青夏教育精英家教网—

阅读理解

　　As part of its ongoing effort to enlist children as the guardians(one who guards)of the future in the fight to save the earth’s environment, the United Nations ecological agency has announced its annual painting competition on the theme of deserts and desertification(沙漠化)．

　　“Children are an important part of our world．They are our future and often they are our conscience．”Klaus Toepfer, Executive Director of the UN Environmental Program(UNEP)said．

　　“Our children provide the inspiration, the enthusiasm and the idealism that this world needs．They know something needs to be done and we must listen to them．One way in which we can listen to them is by giving them the opportunity to express themselves in art－and by taking their art seriously．”

　　The International Painting Competition on the Environment is part of UNEP’s program for children and youth entitled Tunza, which means to treat with care and respect in Swahili．

　　Besides UNEP, the competition is supported by the Japan-based Foundation for Global Peace and Environment(FGPE), Bayer AG and the Nikon Corporation．It has been held annually since 1990 and in that time has received over 160,000 entries from children in over 100 countries．

　　The theme of this year’s Competition, Deserts and Desertification ,is also the theme of the 2006 International Year as well as World Environment Day of that year．

　　The issue of desertification concerns the entire planet, UNEP says, because around one third of the world’s population live in drylands and their worsening is a very real threat to people’s lives and livelihoods, as well as to the health of the planet as a whole．

　　Children who will be between the ages of 6 and 14 years on World Environment Day 2006(5 June 2006)from all regions of the world are invited to deliver their paintings on the theme to their Regional UNEP Office by 20 January 2006．Further information can be obtained at the Competition’s website [ www．unep.org/tunza/paintcomp15]

(1)

The theme of the annual painting competition this year is ________．
[　　]
A．	children the guardians of the future
B．	fighting to save the earth
C．	deserts and desertification
D．	natural disasters

(2)

Which of the following statements about children is WRONG according to the passage?
[　　]
A．	Children can do nothing about the natural world．
B．	Children under six are not allowed to take part in the art competition．
C．	Children are enthusiastic, creative and have new ideas．
D．	Children are the future of the world．

(3)

What’s the situation in the natural environment?
[　　]
A．	One third of the world’s population live in drylands．
B．	Many people’s lives and livelihoods are in danger．
C．	The health of the earth is at stake．
D．	A, B and C．

(4)

From the passage we can know ________．
[　　]
A．	the children’s art competition attracts children from all the developing countries
B．	the art competition is not only supported by UNEP
C．	the theme of every year’s art competition is always the theme of the next International Year
D．	the issue of desertification is related to one-third of the whole world

B
When people lose legs after accidents or illnesses, emergency care and artificial limbs（假肢）often allow them to walk again. Newts （蝾螈） in the same situation, on the other hand, can grow limbs back on their own! Scientists have known for a long time that certain animals can re-grow limbs, but they haven’t quite figured out how these creatures do it.
Researchers have now come up with some new ideas. Their work may give people the ability to re-grow lost limbs. The researchers started with two simple experiments：when you cut a newt’s leg at the ankle, only the foot grows back；when you cut off a leg at the very end, the whole leg grows back. In both cases, the re-growth begins with stem cells. Stem cells can develop into nearly any type of cell in the body.
How do a newt’s stem cells know when to grow only a foot and when to re-grow a whole leg?
This question relates to another mystery. In newt’s, a cut-off leg will grow back only if the nerve bundle（神经束）in it also grows back , but if something prevents the nerve bundle from growing, the stem cells at the wound won’t re-grow a new leg.
In its study, a British team focused on a protein called n-AG. When the team prevented nerves in a limb from growing, but added the n-AG protein to stem cells in the limb, the limb still re-grew. That protein seems to guide limb re-growth. People have proteins that are similar to n-AG. Further research into these materials may someday help human limbs recover by themselves.
40. In the experiments, the researchers cut off a newt’s foot or leg to find out _____.
A. what stem cells were                     B. whether they would grow back
C. how long it would take to re-grow    D. how they would re-grow
41. A newt will re-grow its leg if _____.
A. its ankle was cut off but the nerve bundle was good
B. its leg was cut off and the nerve bundle stopped growing
C. its leg was cut off and the nerve bundle could grow back
D. its ankle and the nerve bundle were cut off
42. What do the underlined words “these materials” refer to?
A. Nerve bundles and proteins.         B. Proteins similar to n-AG.
C. Stem cells and proteins.               D. Stem cells and nerve bundles.
43. The first sentence of the passage _____.
A. acts as a lead–in                       B. shows where researchers got their new ideas
C. states the author’s opinion           D. describes the result of researchers’ studies

When people lose legs after accidents or illnesses, emergency care and artificial limbs（假肢）often allow them to walk again. Newts （蝾螈） in the same situation, on the other hand, can grow limbs back on their own! Scientists have known for a long time that certain animals can re-grow limbs, but they haven’t quite figured out how these creatures do it.
Researchers have now come up with some new ideas. Their work may give people the ability to re-grow lost limbs. The researchers started with two simple experiments：when you cut a newt’s leg at the ankle, only the foot grows back；when you cut off a leg at the very end, the whole leg grows back. In both cases, the re-growth begins with stem cells. Stem cells can develop into nearly any type of cell in the body.
How do a newt’s stem cells know when to grow only a foot and when to re-grow a whole leg?
This question relates to another mystery. In newt’s, a cut-off leg will grow back only if the nerve bundle（神经束）in it also grows back , but if something prevents the nerve bundle from growing, the stem cells at the wound won’t re-grow a new leg.
In its study, a British team focused on a protein called n-AG. When the team prevented nerves in a limb from growing, but added the n-AG protein to stem cells in the limb, the limb still re-grew. That protein seems to guide limb re-growth. People have proteins that are similar to n-AG. Further research into these materials may someday help human limbs recover by themselves.
40. In the experiments, the researchers cut off a newt’s foot or leg to find out _____.
A. what stem cells were                    B. whether they would grow back
C. how long it would take to re-grow    D. how they would re-grow
41. A newt will re-grow its leg if _____.
A. its ankle was cut off but the nerve bundle was good
B. its leg was cut off and the nerve bundle stopped growing
C. its leg was cut off and the nerve bundle could grow back
D. its ankle and the nerve bundle were cut off
42. What do the underlined words “these materials” refer to?
A. Nerve bundles and proteins.         B. Proteins similar to n-AG.
C. Stem cells and proteins.              D. Stem cells and nerve bundles.
43. The first sentence of the passage _____.
A. acts as a lead–in                      B. shows where researchers got their new ideas
C. states the author’s opinion           D. describes the result of researchers’ studies

When people lose legs after accidents or illnesses, emergency care and artificial limbs（假肢）often allow them to walk again. Newts （蝾螈） in the same situation, on the other hand, can grow limbs back on their own! Scientists have known for a long time that certain animals can re-grow limbs, but they haven’t quite figured out how these creatures do it.

Researchers have now come up with some new ideas. Their work may give people the ability to re-grow lost limbs. The researchers started with two simple experiments：when you cut a newt’s leg at the ankle, only the foot grows back；when you cut off a leg at the very end, the whole leg grows back. In both cases, the re-growth begins with stem cells. Stem cells can develop into nearly any type of cell in the body.

How do a newt’s stem cells know when to grow only a foot and when to re-grow a whole leg?

This question relates to another mystery. In newt’s, a cut-off leg will grow back only if the nerve bundle（神经束）in it also grows back , but if something prevents the nerve bundle from growing, the stem cells at the wound won’t re-grow a new leg.

In its study, a British team focused on a protein called n-AG. When the team prevented nerves in a limb from growing, but added the n-AG protein to stem cells in the limb, the limb still re-grew. That protein seems to guide limb re-growth. People have proteins that are similar to n-AG. Further research into these materials may someday help human limbs recover by themselves.

40. In the experiments, the researchers cut off a newt’s foot or leg to find out _____.

A. what stem cells were B. whether they would grow back

C. how long it would take to re-grow D. how they would re-grow

41. A newt will re-grow its leg if _____.

A. its ankle was cut off but the nerve bundle was good

B. its leg was cut off and the nerve bundle stopped growing

C. its leg was cut off and the nerve bundle could grow back

D. its ankle and the nerve bundle were cut off

42. What do the underlined words “these materials” refer to?

A. Nerve bundles and proteins. B. Proteins similar to n-AG.

C. Stem cells and proteins. D. Stem cells and nerve bundles.

43. The first sentence of the passage _____.

A. acts as a lead–in B. shows where researchers got their new ideas

C. states the author’s opinion D. describes the result of researchers’ studies