单项选择题

Scientists assume that unrestrained population growth and dwindling resources may force humans to look to the sea for food.

A．unavoidable
B．unexpected
C．unchecked
D．unfortunate
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单项选择题
The Prime Minister explained the new policy of his government in great detail so as to win the support of his people.
A．at last
B．at length
C．at most
D．at least
单项选择题
The quality and number of a city's public roads offer an excellent means of gauging its prosperity.
A．protecting
B．creating
C．judging
D．tracing
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