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
(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
单项选择题
Like any other (constant) repeated action, speaking (has to) be learned, but once it (is learned), it becomes a generally (unconscious) and apparently automatic process.
A．constant
B．has to
C．is learned
D．unconscious
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