单项选择题

(Sound waves) travel (in the air) in much (the same) way (like) water waves spread on the water.

A．Sound waves
B．in the air
C．the same
D．like
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单项选择题
He is a (well-known) hardworking and clever student, and he often gets top (scores) in his class; so all his classmates (are sure) that he (studies very hardly).
A．well-known
B．scores
C．are sure
D．studies very hardly
单项选择题
(Although) the wages for all the members of the working staff (increase regularly), so (their expenses do); for the prices for everything (are increasing dramatically) at the same time.
A．Although
B．increase regularly
C．their expenses do
D．are increasing dramatically
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