单项选择题

The origin of language is ______.

A．clearly explained in this passage
B．a matter that can not be or has not been explained or understood
C．a question that was difficult to answer
D．a problem already solved

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热门试题

单项选择题

A great writer is one who ______.

A．has great thoughts
B．is good at deeply impressing us with the power of correct words
C．is careful in choosing correct words
D．both A and B

单项选择题

A survey was carried out on the death rate of new-born babies in that region, the results of which were surprising.

A．一项关于新生儿死亡率的调查在那个地区被展开，结果令人惊讶。
B．一项关于那个地区新生儿死亡率的调查被执行，结果令人惊讶。
C．那个地区的新生儿死亡率的调查表令人惊讶。
D．在那个地区进行了一次新生儿死亡率调查，结果令人惊讶。