单项选择题

The phrase "this element of the unknown"(Paragraph 3) refers to ______.

A．the extension of earthquake zones
B．the percentage of earthquake occurrences
C．when and where earthquakes may occur
D．what big damage earthquakes may cause

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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.

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