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
C．calling
D．being
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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
单项选择题
The once separate issue of environment and development are now ______ linked.
A．intangible
B．indispensable
C．inextricably
D．incredibly
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