单项选择题

If a scientist holds an idea to be true and finds any counter evidence whatever, the idea is either or abandoned.

A．modified
B．ascertained
C．testified
D．violated
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单项选择题
It can be concluded that the disaster we are faced with now _________.
A．is a by-product of the oil-producing countries
B．is where to find new energy resources
C．can not be solved without coordinated efforts
D．is that no resources are inexhaustible
单项选择题
According to the author, to prevent the country from falling back, _________.
A．we must revive morality and the spirit of devotion
B．we should decrease the use of cars
C．we must fight against lawbreaking behavior
D．we should defend our ideals wholeheartedly
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