单项选择题

Unless the population growth stabilizes, environmentalists predict a worldwide starvation by the next decade.

A．famine
B．shortage
C．rebellion
D．infection
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单项选择题
A new water boiler was installed in our building last week, which could provide hot water to the students.
A．inspected carefully
B．placed in service
C．undertaken with care
D．undone casually
单项选择题
There isn't sound proof to support his biological theory.
A．financing
B．publications
C．evidence
D．appreciation
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