单项选择题

The Portuguese give a great deal of credit to one man for having promoted sea travel, that man ______ Prince Henry the navigator, who lived in the 15th century.

A. was
B. was called
D. calling
D. being
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单项选择题
If there is the need to compete in a crowd, to battle ______ the edge the surest strategy is to develop the unexpected.
A．on
B．for
C．against
D．with
单项选择题
It is a myth that the law permits the Food and Drug Administration to ignore requirements for ______ drugs while brand-name drugs still must meet these rigid tests.
A．specific
B．generic
C．intricate
D．acrid
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