单项选择题

Mary is as ______ as a peacock and always wants to be the focus of attention.

A．beautiful
B．smart
C．slender
D．vain
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单项选择题
Gathering of more than three persons were prohibited, supposedly in the name of______.
A．the law and the order
B．law and order
C．the order and the law
D．order and law
单项选择题
To prove their theories, scientists must ______ an adequate amount of data as evidence.
A．stimulate
B．reproduce
C．reserve
D．accumulate
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