搞定ACT阅读自然科学样题一篇顶三篇

　　恭喜你，你已经完成了第一步的任务，再接再厉，离成功只有一步之遥了哦!

　　Questions

　　「1」The main point of this passage is to:

　　A. illustrate the importance of genetics in the formation of a baby’s brain.

　　B. illustrate the importance of stimulation and experience in the formation of a baby’s brain.

　　C. indicate the great need for conducting further research on babies’ brains.

　　D. compare the latest research on babies’ brains with similar research conducted fifteen years ago.

　　解析：这道题的正确答案是B。因为在整篇文章中，作者主要侧重于“出生后的经历，而不是天生的事物，确定人类大脑的实际接线”。 第三，第四和第五段特别关注这个话题，说明“儿童早期的经历如何”， “对大脑的电路如何”以及“经验如何通过加强突触来发挥作用”作者接着说，强化这些发展突触的方法“已经被称为刺激”。

　　「2」The main point made in the second, third, and fourth paragraphs (lines 14–52) is that the structure of a baby’s brain:

　　E. is genetically determined before the child is born.

　　F. can be seen through positron-emission tomography.

　　G. can be altered through a process known as pruning.

　　H. is still developing after the child is born.

　　解析：这道题的正确答案是H。第一、二、三自然段分别表示了宝宝的大脑的结构仍在发展：“宝宝的大脑仍然在孩子之后形成”; “出生后的经历，而不是天生的东西，决定人类大脑的实际连线”;“在生命的头几个月，突触的数量将增加20倍”。

　　「3」According to the passage, one thing PET allows neurobiologists to do is:

　　A. observe activity in the frontal cortex of a baby’s brain.

　　B. determine the number of genes involved in the formation of a baby’s brain.

　　C. control the release of neurotransmitters in a baby’s auditory cortex.

　　D. restore microscopic connections in a baby’s brain.

　　解析：这道题的正确答案是A。文章第二段清楚地解释说，PET用于观察大脑的区域并测量脑干中的活动; 没有证据表明PET可以控制任何东西的释放。

　　「4」When she compares a baby’s brain to city neighborhoods, the author is most nearly illustrating her point that:

　　E. neurotransmitters are actually brain chemicals.

　　F. regions of the brain are awakened through experience.

　　G. the visual cortex allows a baby to recognize specific images.

　　H. a baby’s brain has about 1,000 trillion synapses.

　　解析：这道题的正确答案是F。在第二段中，作者在停电后用类似的方式将电力恢复到城市社区，以帮助解释神经生物学家如何使用PET来观察“一个接一个的宝宝的大脑区域”，宝宝年龄越来越大，越来越多的经验。所以可以看出来宝宝大脑的区域通过经验唤醒。

　　「5」Which of the following would the author of the passage be LEAST likely to recommend as a way to strengthen the synapses of a baby’s brain?

　　A. Reading to a baby

　　B. Playing peekaboo with a baby

　　C. Teaching a baby with flashcards

　　D. Showing a baby how to distinguish red socks from blue blocks

　　解析：这道题的正确答案是C。这个问题要求考生选择最不可能的方法来加强婴儿的神经突触。“stimulation does not mean subjecting a toddler to flashcards”明确指出，刺激并不意味着让幼童使用抽认卡。”这表明，抽认卡并不是加强大脑联系的首选方法。

　　「6」The last paragraph suggests that the formation of synapses occurs most rapidly:

　　E. during the first two months of a child’s life.

　　F. during the first nine months of a child’s life.

　　G. from the time a child is about six months old until that child is about ten years old.

　　H. from the time a child is about one year old until that child is well into adolescence.

　　解析：这道题的正确答案是G。从“In the second half of the first year . . . , the prefrontal cortex . . . forms synapses at such a rate that it consumes twice as much energy as an adult brain. That furious pace continues for the child's first decade of life.”知答案选G。

　　「7」it is used in line 30, the phrase something innate most nearly means:

　　A. a memory.

　　B. earned behavior.

　　C. physical immaturity.

　　D. an inherited trait.

　　解析：这道题的正确答案选D。单词“innate ”意味着“existing at birth”。

　　「8」The fifth paragraph (lines 53–70) suggests that one of the main causes of pruning is:

　　E. a lack of stimulation.

　　F.an insufficient number of genes.

　　G. the use of flashcards.

　　H. the strengthening of synapses.

　　解析：这道题的正确答案是E。从“has come to be known as stimulation”我们知道答案选E。

　　「9」When the author refers to “entrepreneurs preying on the anxieties of new parents” (lines 60–61), she is most likely suggesting that new parents should:

　　A. give their babies products such as flashcards only if they have examined these products carefully.

　　B. not be deceived by advertising that claims certain products will increase a baby’s intelligence.

　　C. not worry if their babies’ development is slightly behind that suggested by neurobiologists.

　　D. take their pediatrician’s advice before they listen to the advice given by other family members.

　　解析：这道题的正确答案是B。这是唯一合乎逻辑的选择，因为“企业家痴迷于新父母的忧虑”这一短语表明，父母对于可能受到企业家的欺骗，应该谨慎，父母应特别警惕那些声称闪卡的企业家。

　　「10」The passage states that, in terms of development, the average baby should be able to:

　　E. focus his or her eyes on an object at two months of age.

　　F. develop a “startle” reflex at about two months of age.

　　G. make logical connections between ideas at about four months of age.

　　H. form explicit memories at about nine months of age.

　　解析：这道题的正确答案是H。从“At 8 or 9 months the hippocampus, which indexes and files memories, becomes fully functional; only now can babies form explicit memories of, say, how to move a mobile. ”我们知道婴儿大约9个月大的时候形成明确的记忆。

　　坚持看到最后的你棒棒哒~

　　以上就是新东方在线ACT学习网为你带来的搞定ACT阅读自然科学样题一篇顶三篇，更多精彩敬请关注新东方在线ACT学习网（http://act.koolearn.com）。