单项选择题

As aquatic plants moved millions of years ago from the ocean to the land, they underwent a number of adaptations.

A．mishaps
B．expansions
C．setbacks
D．modifications
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单项选择题
Red giant stars do not become white dwarf stars abruptly; the process takes more than fifteen hundred years.
A．suddenly
B．in unison
C．prematurely
D．accidentally
单项选择题
While they were away on vacation, they allowed their mail to accumulate at the post office.
A．be delivered
B．pile up
C．get lost
D．be returned
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