单项选择题

We can infer from the passage that quakes ______.

A．may happen anywhere at any time
B．mostly strike in oceans and mour~tains
C．are unobservable in masses of land
D．are hardly the direct cause of fatalities

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单项选择题

A．haveB．holdC．takeD．play

A．have
B．hold
C．take
D．play

单项选择题

Which of the following describes the author's purpose in writing the passage

A．Inform the reader.
B．Entertain the reader.
C．Disprove a concept.
D．Question a concept.