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
John is collaborating with Mary in writing an article.
A．cooperating
B．competing
C．combining
D．arguing
单项选择题
These programmes are of immense value to old people.
A．natural
B．fatal
C．tiny
D．enormous
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