( )对投资组合的影响可以通过投资的多元化加以消除。
A. 系统风险
B. 非系统风险
C. 总风险
D. 市场风险
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The writer's attitude toward nuclear energy is ______.
A. indifferent
B. tolerant
C. favorable
D. negative
The product was attacked when it was first（） , but gradually it was accepted.
A. advanced
B. occurred
C. appeared
D. challenged
According to the author, competition differs from conflict in that______.
A. it results in war in most cases
B. it induces efforts to expand territory
C. it is a kind of opposition among social entities
D. it is essentially a struggle for existence
He must have overslept, or he （） then.
A. would have been here
B. had to be here
C. should be here
D. would be here
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