单项选择题

Most nurses are women, but in the higher ranks of the medical profession women are a（）.

A．scarcity
B．minority
C．minimum
D．shortage

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单项选择题
Good pencil erasers are soft enough not（）paper but hard enough so that they crumble gradually when used.

A．by damaging
B．so that they damage
C．to damage
D．damaging
单项选择题
（）a language family is a group of languages with a common origin and similar vocabulary, grammar, and sound system.

A．What linguists call
B．It is called by linguists
C．Linguists call it
D．What do linguists call
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