阅读理解 When a young short-toed treecreeper hatches from the egg, it is hairless, blind, and helpless. At birth it weighs 0.8 gram. Its manifestations of life are wholly out of tune with its quest to ac 题目和参考答案——青夏教育精英家教网—

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　　When a young short-toed treecreeper (旋木雀)hatches from the egg, it is hairless, blind, and helpless. At birth it weighs 0.8 gram. Its manifestations (现象) of life are wholly out of tune with its quest (追求) to achieve a weight of 8 to 9 grams as quickly as possible, the latter being the weight of an adult treecreeper. To achieve this end the chick must eat, and it must also be warmer than its environment. It gets food from its parents, but warmth from its mother alone. In all this the youngster does not do much of an active nature. On the first day it begins to stretch itself, raising its neck high and opening its beak. It also responds to the feeding calls of its parents, which are made only if the chick does not open up. During the first few days, the chick cannot see, but it can tempt the parents to provide feedings by sending out a begging call.

　　Heartman (1953) took six of the seven young pied flycatchers (relatives of the treecreeper) out of their nest. Since there was now only one chick in the nest, the parents were not as quick to provide frequent feedings. The other six chicks, now hungry, were then brought near the nest so that their parents could hear all the seven even they could see only one. At once the rate (率) of attempted feedings doubled. The one chick in the nest could not handle the large amount of food, naturally, so the parents ended up eating some of it themselves.

1．How many different types of birds are referred to in the passage?

[　　]

A．One.

B．Two.

C．Six.

D．Seven.

2．According to the passage, which of the following is the most important in satisfying the baby treecreeper's need for warmth?

[　　]

A．The materials in the nest.

B．The mother bird.

C．The father bird.

D．The other chicks of the hatch.

3．The purpose of the parent treecreeper's feeding calls is to ________.

[　　]

A．note the need for food

B．warn the babies against its enemy

C．increase the variety of food

D．get the baby to open its mouth

4．Which of the following helps newborn treecreepers to gain weight?

[　　]

A．Begging noises.

B．Low body temperature.

C．Feathers.

D．Good eyesight.

5．It is most likely that the writer is using these paragraphs as ________.

[　　]

A．an introduction to a discussion of various kinds of birds

B．a broad description of bird development

C．a set of instruction for raising birds

D．examples of a general statement about bird feeding

答案：B;B;D;A;D

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How Long Can People Live?

　　She took up skating at age 85, made her first movie appearance at age 114, and held a concert in the neighborhood on her 121st birthday．

　　Whe n it comes to long life, Jeanne Calment is the world’s recordholder．She lived to the ripe old age of 122．So is 122 the upper limit to the human life span(寿命)?If scientists come up with some sort of pill or diet that would slow aging, could we possibly make it to 150－or beyond?

　　Researchers don’t entirely agree on the answers．“Calment lived to 122, so it wouldn’t surprise me if someone alive today reaches 130 or 135,”says Jerry Shay at the University of Texas．

　　Steve Austad at the University of Texas agrees．“People can live much longer than we think,”he says．“Experts used to say that humans couldn’t live past 110．When Calment blew past that age, they raised the number to 120．So why can’t we go higher?”

　　The trouble with guessing how old people can live to be is that it’s all just guessing．“Anyone can make up a number,”says Rich Miller at the University of Michigan．“Usually the scientist who picks the highest number gets his name in Time magazine．”

　　Won’t new anti-aging techniques keep us alive for centuries?Any cure, says Miller, for aging would probably keep most of us kicking until about 120．Researchers are working on treatments that lengthen the life span of mice by 50 percent at most．So, if the average human life span is about 80 years, says Miller,“adding another 50 percent would get you to 120．”

　　So what can we conclude from this little disagreement among the researchers?That life span is flexible(有弹性的)，but there is a limit, says George Martin of the University of Washington．“We can get flies to live 50 percent longer,”he says．“But a fly’s never going to live 150 years．”

　　“Of course, if you became a new species(物种)，one that ages at a slower speed, that would be a different story,”he adds．

　　Does Martin really believe that humans could evolve(进化)their way to longer life?“It’s pretty cool to think about it,”he says with a smile．

(1)

What does the story of Jeanne Calment prove to us?
[　　]
A．	People can live to 122．
B．	Old people are creative．
C．	Women are sporty at 85．
D．	Women live longer than men．

(2)

According to Steve Austad at the University of Texas, ________．
[　　]
A．	the average human life span could be 110
B．	scientists cannot find ways to slow aging
C．	few people can expect to live to over 150
D．	researchers are not sure how long people can live

(3)

Who would agree that a scientist will become famous if he makes the wildest guess at longevity?
[　　]
A．	Jerry Shay．
B．	Steve Austad
C．	Rich Miller
D．	George Martin

(4)

What can we infer from the last three paragraphs?
[　　]
A．	Most of us could be good at sports even at 120．
B．	The average human life span cannot be doubled．
C．	Scientists believe mice are aging at a slower speed than before．
D．	New techniques could be used to change flies into a new species．

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