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

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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
单项选择题
Most comets have two kinds of tails, one made up of dust,（）made up of electrically charged particles called plasma.

A．one another
B．the other
C．other ones
D．each other
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