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
Which of the following CAN NOT 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.
单项选择题
A role is best defined in its relation to______.
A．another status
B．its obligation
C．other roles
D．its importance
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