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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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
单项选择题
If he (was to come) here this afternoon, I (should ask) him to go to the party (held by) student (union).
A．was to come
B．should ask
C．held by
D．union
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