单项选择题

(More and more) old people whose (grown-up children) pay little attention to them (gathered) together and organize (interesting activities) for themselves.

A．More and more
B．grown-up children
C．gathered
D．interesting activities
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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
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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