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It is, everyone agrees, a huge task that the child performs when he learns to speak, and the fact that he does so in so short a period of time challenges explanation.

Language learning begins with listening. Individual children vary greatly in the amount of listening they do before they start speaking and late starters are often long listeners. Most children will “obey” spoken instructions some time before they can speak, though the word obey is hardly accurate (精确) as a description of the eager and happy cooperation usually shown by the child. Before they can speak, many children will also ask questions by gestures and by making questioning noises.

Any attempt to trace (探察) the development from the noises babies make to their first spoken words leads to considerable difficulties. It is agreed that they enjoy making noises and that during the first few months one or two noises sort themselves out to show joy, sadness, and so on. But since these cannot be said to show the baby’s intention to communicate, they can hardly be regarded as early forms of language. It is agreed, too, that from about three months they play with sounds for enjoyment, and that by six months they are able to add new sounds. This self-imitation (自我模仿) leads on to imitation of sounds made or words spoken to them by other people. The problem then arises as to the point at which one can say that these imitations can be considered as a speech.

1．The third paragraph is mainly about ____

A．the development of babies’ early forms of language

B．the difficulties of babies in learning to speak

C．babies’ strong desire to communicate

D．babies’ intention to communicate

2．The author’s purpose in writing the second paragraph is to show that children ____.

A．usually obey without asking questions

B．are not active in the process of learning to speak

C．are born cooperative

D．learn to speak by listening

3．From the passage we learn that ____.

A．early starters can learn to speak within only six months

B．children show a strong desire to communicate by making noises

C．imitation plays an important role in learning to speak

D．children have various difficulties in learning to speak

4．The best title for this passage would be ____.

A．How Babies Learn to Speak    B．Early Forms of Language

C．A Huge Task for Children       D．Noise Making and Language Learning

答案

小题1:A

小题2:D

小题3:C

小题4:A

单项选择题

下列哪种生理作用不能体现蛋白质的功能（）

A.胰岛素的信息传递作用

B.血红蛋白的运输功能

C.性激素促进生殖细胞生成

D.唾液淀粉酶的催化功能
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填空题

[A] However, the production of TG is controlled by an enzyme that is, in turn, encoded by a gene called UGT2B17. This gene comes in two varieties, one of which has a part missing and therefore does not work properly. A person may thus have none, one or two working copies of UGT2B17, since he inherits one copy from each parent. Dr Schulze guessed that different numbers of working copies would produce different test results. She therefore gave healthy male volunteers whose genes had been examined a single 360mg shot of testosterone (the standard dose for legitimate medical use) and checked their urine to see whether the shot could be detected.

[B] Dr Schulze also says there is substantial ethnic variation in UGT2B17 genotypes. Two-thirds of Asians have no functional copies of the gene (which means they have a naturally low ratio of TG to EG), compared with under a tenth of Caucasians--something the anti-doping bodies may wish to take into account.

[C] The test usually employed for testosterone abuse relies on measuring the ratio of two chemicals found in the urine, testosterone glucuronide (TG) and epitestosterone glucuronide (EG). The former is produced when testosterone is broken down, while the latter is unrelated to testosterone metabolism, and can thus serve as a reference point for the test. Any ratio above four of the former to one of the latter is, according to official Olympic policy, considered suspicious and leads to more tests.

[D] The result was remarkable. Nearly half of the men who carried no functional copies of UGT2B17 would have gone undetected in the standard doping test. By contrast, 14% of those with two functional copies of the gene were over the detection threshold before they had even received an injection. The researchers estimate this would give a false-positive testing rate of 9% in a random population of young men.

[E] The agencies have had remarkable success. Testing for anabolic steroids (in other words, artificial testosterone) was introduced in the 1970s, and the incidence of cheating seems to have fallen dramatically as a result (see chart). The tests, however, are not foolproof. And a study just published in the Journal of Clinical Endocrinology & Metabolism by Jenny Jakobsson Schulze and her colleagues at the Karolinska Institute in Sweden suggests that an individual’s genetic make-up could confound them in two different ways. One genotype, to use the jargon, may allow athletes who use anabolic steroids to escape detection altogether. Another may actually be convicting the innocent.

[F] Cheating in sport is as old as sport itself. The athletes of ancient Greece used potions to fortify themselves before a contest, and their modern counterparts have everything from anabolic steroids and growth hormones to doses of extra red blood cells with which to invigorate their bodies. These days, however, such stimulants are frowned on, and those athletes must therefore run the gauntlet of organisations such as the World Anti-Doping Agency, which would rather they competed without resorting to them.

[G] In the meantime, Dr Schulze’ s study does seem to offer innocents a way of defending themselves. Athletes travelling to Beijing for the Olympic games later this year may be wise to travel armed not only with courage and the "spirit of Olympianism", but also with a copy of their genetic profile, just in case.

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