单项选择题

In China, all the students between the ages of 7 and 16 or so must receive nine-year ______ education.

A．constrained
B．compulsory
C．cardinal
D．conventional
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单项选择题
In a traffic accident, some outer damages to car body are often______.
A．indifferent
B．invisible
C．negligible
D．ignorant
单项选择题
On the basis of their models, scientists are of the opinion that______.
A．the climate of the world should be becoming cooler
B．the new Ice Age will be delayed by the greenhouse effect
C．the man-made warming effect helps to increase the solar effects
D．it will take thousands of years for the inertia of the earth's climate to take effect
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