单项选择题

Many scientists have been probing psychological problems.

A．solving
B．exploring
C．settling
D．handling
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单项选择题
The food is insufficient for three people.
A．instant
B．infinite
C．inexpensive
D．inadequate
单项选择题
A great deal has been done to remedy the situation.
A．maintain
B．improve
C．assess
D．protect
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