He kept yawning in class this morning. That is _____ he stayed up late doing his homework last night.

A. why????????????? B. how???????????? C. because???????????? D. whether

 

【答案】

C

【解析】

試題分析：句意：今天早晨上課他一直在打哈欠。那是因?yàn)樗蛲戆疽沟胶芡韺懠彝プ鳂I(yè)的緣故。通過分析句子結(jié)構(gòu)，可知這個(gè)句子中包含一個(gè)表語從句，且表示“因?yàn)?/span>”，這樣的意思，所以用because，選C。

考點(diǎn)：考查表語從句

 

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     One kind of female butterfly mates only once in its life —and then closes its wings to avoid
"harassment" when pursued by persistent and unwanted males, a Japanese researcher said.
     Observations of the Small Copper Butterfly, a colourful orange and black butterfly, showed that some
females closed their wings when males flew by, but only when they were males of their own species, said
Jun-Ya Ide, an associate professor at Kurume Institute of Technology in Fukuoka, western Japan.
     "When we looked into why, the males were courting the females. They do this very stubbornly, so the
females sometimes try to get away-or prefer to stay unobserved," he added.
     Ide and his colleagues brought a model of a male butterfly near the females to test their reactions and
found that young females that had yet to mate kept their wings open, but those that had already mated
closed them.
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—with the male often in pursuit —uses up strength and can even shorten their lives, he added.
     "Closing their wings makes them less visible, helping them avoid communication with their own species. We figured they were trying to avoid harassment by males," Ide said.
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