单项选择题

The scientific group is carrying out a research focused on a drug which is so _______ as to be able to change brain chemistry.

A．powerful
B．influential
C．monstrous
D．vigorous
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单项选择题
Though he views himself as a realist, Michael says that his findings make him very _______ about future.
A．optimistic
B．objective
C．precautious
D．sympathetic
单项选择题
You said the books were on the desk, but _______ there.
A．there was no one
B．there were none
C．there were no ones
D．was none
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