单项选择题

A scientist does not accept statements which are not based on the most complete evidence available. Instead, he always checks, studies and makes experiments carefully and objectively to ______ them.

A．testify
B．verify
C．affirm
D．assert
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He was______ for military service at the age of eighteen and spent a year in the army.
A．called in
B．sent out
C．called up
D．taken on
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Some people______ in part the defeat of the revolution in France and Germany to the English diplomacy.
A．contributed
B．attributed
C．assigned
D．owed
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