单项选择题

The United Nations' experts are supposed to

A．construct strong buildings.
B．put forward proposals.
C．detect disastrous earthquakes.
D．monitor earthquakes.
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单项选择题
The destruction of Agadir is an example of
A．faulty building construction.
B．an earthquake's strength.
C．widespread panic in earthquakes.
D．ineffective instruments.
单项选择题
Which of the following CANNOT be concluded from the passage
A．The number of earthquakes is closely related to depth.
B．Roughly the same number of earthquakes occur each year.
C．Earthquakes are impossible at depths over 460 miles.
D．Earthquakes are most likely to occur near the surfaces.
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