单项选择题

The magician picked several persons（）from the audience and asked them to help him with the performance.

A．by accident
B．at random
C．on occasion
D．on average

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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
If you think her experience is（）, we will employ her.

A．sustainable
B．adequate
C．strong
D．positive
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