40.B。本文主要讲述爱的力量。此句点明主题。所以选B。

　　答案：

　　21 – 25

　　CBDAB

　　26 – 30

　　CADBC

　　31 – 35

　　DACDA

　　36 – 40

　　CBDAB

　　解析：41.细节题：通过这句话“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”可知这些老鼠分成了7组。所以答案选D。

　　42.主旨大意题：从文章第一句话People born in the winter are more likely to suffer mental health disorders可知“冬天出生的人对身体有影响”所以答案选C。

　　43.单词推测：根据上下文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,可知split是“分裂成”所以选A。

　　44.细节题：从此句But among the winter-born 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.可知A答案是正确的。

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