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
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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
单项选择题
The most famous Shoshone Indian was Sacagawea—the woman who accompanied Lewis and Clark on their exploration of the upper Missouri River.
A．traveled with
B．argued with
C．defended
D．avoided
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