单项选择题

The significance of the slow speed of tsunamis is that people may ______.

A．notice them out at sea
B．be warned early enough
C．find ways to prevent them
D．develop warning systems
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单项选择题
The example of the toy building shows that ______.
A．well constructed building could resist an earthquake
B．the destruction depends on an earthquake's strength
C．ineffective instruments cause the destruction
D．we should construct our building like a toy building
单项选择题
The United Nations' experts are supposed to
A．construct strong buildings
B．detect disastrous earthquakes
C．put forward proposals
D．monitor earthquakes
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