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
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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
单项选择题
No punishment is too severe for such an ______ crime. It is almost impossible to understand its enormity.
A．avaricious
B．exemplary
C．arbitrary
D．egregious
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