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。那是因為他昨晚熬夜到很晚寫家庭作業(yè)的緣故。通過分析句子結(jié)構(gòu)，可知這個句子中包含一個表語從句，且表示“因為”，這樣的意思，所以用because，選C。

考點：考查表語從句

 

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"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
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found that young females that had yet to mate kept their wings open, but those that had already mated
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