单项选择题

The basic rock material is referred to ______.

A．as the matrix
B． be the matrix
C．by scientist to be the matrix
D．as being the matrix
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单项选择题
Now a person works for a certain amount of money _____ he can pay for food and clothing.
A．in case
B． so that
C．as to
D．such as
单项选择题
Scientists predict that the world’s known oil resources will _____ early in the next century.
A．run off
B．run out
C．run up
D．run over
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