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 significance of the slow speed of tsunamis is that people may ______.
A．notice them out at sea
B．find ways to stop them
C．be warned early enough
D．develop warning systems
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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