单项选择题

Doctors say that the disease is most （） in the first twenty-four hours.

A．ingenious
B．infectious
C．incompatible
D．instantaneous

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单项选择题
I believe his whole argument is based on a false （）.

A．paradox
B．junction
C．dilemma
D．premise
单项选择题
Most scientists believe it is （） to use animals in medical research.

A．legitimate
B．explicit
C．edible
D．illiterate
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