单项选择题

No one would have time to read or listen to an account of everything ______ going on in the world.

A．it is
B．there is
C．as is
D．what is
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单项选择题
It is a myth that the law permits the Food and Drug Administration to ignore requirements for ______ drugs while brand-name drugs still must meet these rigid tests.
A．specific
B．generic
C．intricate
D．acrid
单项选择题
The possibility that the explosion was caused by sabotage cannot be ______.
A．broken out
B．cancelled out
C．ruled out
D．wiped out
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