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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单项选择题
Are you still ______ that the climbers can be rescued
A．enthusiastic
B．optimistic
C．pessimistic
D．domestic
单项选择题
Research shows that pupils who are good at math tend to be more conformist and ______ than other pupils.
A．obscure
B．obvious
C．obedient
D．objective
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