单项选择题

Investment in new product development is an essential ______ of corporate success.

A．component
B．ingredient
C．constituent
D．element
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单项选择题
Thousands of people are needlessly ______ each year in road accidents.
A．smuggled
B．staggered
C．slaughtered
D．snatched
单项选择题
Fields ______ to the nuclear facility were found to have high levels of radioactivity.
A．abrupt
B．adverse
C．adjacent
D．intact
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