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
Some criminals were printing （） dollar bills until they were arrested.

A．decent
B．fake
C．eccentric
D．suspicious
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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