单项选择题

Many types of rock are ______ from volcanoes as solid, fragmentary material.

A．ejected
B．injected
C．propelled
D．flung

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单项选择题

You must insist that students give a truthful answer_______with the reality of their world.

A．relevant
B．simultaneous
C．consistent
D．practical

单项选择题

%he basic features of the communication process are identified in one question: Who says ______ through what channel to whom

A．what
B．when
C．how
D．such

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