单项选择题

We can improve our speeches and writings ______.

A．by using words at random
B．by using words with care and accuracy
C．by using beautiful words we like
D．by using words which are grammatically right
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单项选择题
______ men invented certain sounds to express thoughts and actions.
A．Because they wanted to agree on certain signs
B．As they needed to write them down
C．Since they wanted to communicate with each other
D．Now that they could combine them
单项选择题
A．worseB．beautifulC．betterD．excellent
A．worse
B．beautiful
C．better
D．excellent
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