People born in winter are more likely to suffer mental health disorders, according to a recent study carried out by researchers at Vanderbilt University in Tennessee.
Researchers raised baby mice from birth to weaning (斷奶) in either “summer” light cycles of 16 hours of light and 8 hours of dark or “winter” cycles of 8 hours of light and 16 hours of dark. A third group experienced 12 hours of light and 12 hours of dark a day.
Then half the winter mice stayed in a winter cycle, while half switched to a summer schedule. The summer mice were similarly split. The mice raised in equal periods of light and dark were split into three groups, one of which stayed on the 12­hour schedule, one of which joined the winter group, and one of which joined the summer group.
After 28 days, it turns out the summer­born mice behaved the same whether they stayed on the summer cycle or switched to winter. But among the winter­born mice, those stayed in winter kept their previous schedule, while those that switched to summer stayed active for an extra hour and a half, which indicates that mice born and weaned in a winter light cycle showed dramatic disruptions in their biological clocks.
The finding is the first of its kind in mammals, and it could explain why people born in winter are at higher risk for mental health disorders including bipolar depression, schizophrenia and seasonal affective disorder.
“We know that the biological clock regulates mood in humans，”said study researcher McMahon. “If the mechanism (機(jī)制) similar to the one that we found in mice operates in humans, then it could not only have an effect on a number of behavioral disorders, but also have a more general effect on personality.”
小題1:How many groups of mice are there finally in all in the experiment?
A．Four.B．Five.C．Six. D．Seven.
小題2:What's the main idea of the text?
A．The biological clock regulates mood in humans.
B．People born in winter are at higher risk for physical health disorders.
C．Being born in winter has a negative effect on people's mental health.
D．The length of light will influence the behavior of the mice.
小題3:The underlined word “split”(Paragraph 3) can be replaced by ________.
A．endedB．tornC．hitD．divided
小題4:Who is the appropriate reader of the passage?
A．A job­hunter.B．A student in the university.
C．A newly­married couple.D．An experienced dentist.

小題1:D
小題2:C
小題3:D
小題4:C 

試題分析：本文介紹了一項(xiàng)最新的研究結(jié)果，結(jié)果表明冬天出生的人更容易患心理疾病。
小題1:細(xì)節(jié)理解題。在第二段中提到了分成了三組，而在第三段中又將這三組分別分 成了兩組、兩組和三組，因此在實(shí)驗(yàn)中一共有七組老鼠。選D
小題2:主旨大意題。通讀全文可知，文章的第一段就開門見山地點(diǎn)明了本文的主旨， 即冬天出生的人更有可能存在心理障礙，因此選 C。
小題3:詞義猜測(cè)題。根據(jù)第三段的第一句及畫線詞后面的“were split into three groups” 可推知，“split”與“divided”同義，意為“被分開”。D
小題4:推理判斷題。通讀全文可知，本文告訴我們出生時(shí)間對(duì)人的精神健康的影響， 再結(jié)合四個(gè)備選項(xiàng)可知，新婚夫婦應(yīng)是最合適的讀者。選C 
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