单项选择题

Investment in new product development is an essential______ of corporate success.

A．element
B．component
C．ingredient
D．constituent
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单项选择题
It is unreasonable to battle the______ by increasing the tariff rate.
A．disposition
B．discrepancy
C．defect
D．deficit
单项选择题
The______ explanations that the responsible gave for the huge loss in foreign trade couldn't exempt him from the punishment of the company's regulation.
A．dim
B．obscure
C．conspicuous
D．intelligible
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