单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．15 minutes.
B．30 minutes.
C．20 minutes.
D．25 minutes.
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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．be warned early enough
C．find ways to prevent them
D．develop warning systems
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
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