单项选择题

His theories were so ______ that few could see what he was trying to establish.

A．logical
B．scholarly
C．theoretical
D．vague
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单项选择题
To prevent a repetition of this dreadful occurrence, we must discover the element in the food that was served.
A．unknown
B．toxic
C．kind
D．shameful
单项选择题
Huxley is ______ optimistic for the future of either man or plant on this planet.
A．anything but
B．nothing but
C．above all
D．rather than
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