单项选择题

One of the reasons why men invented certain sounds to express thoughts and actions was that they could ______.

A．agree with certain signs
B．write them down
C．make themselves understand each other
D．combine them
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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。
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
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