单选题：The cause of AIDS remains a mystery to researchers.

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题目内容：
The cause of AIDS remains a mystery to researchers. A．Right
B．Wrong
C．Not mentioned

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答案解析：

Courageous people think quickly and act without hesitation.

Courageous people think quickly and act without hesitation.A．complaint B．conside

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What were the effects of the decision she made?

What were the effects of the decision she made?A．reasons B．results C．causes D．ba

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Who brought the Frenchmen's neckwear to Britain?

Who brought the Frenchmen's neckwear to Britain?A．Tony Blair. B．Charles ll. C．Ji

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A red flag was placed there as a token of danger.

A red flag was placed there as a token of danger.A．sign B．substitute C．proof D．t

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某人拥有一套住房，若出租，则年租赁净收入为2万元。若其拟出售此住房，并要求年收益率为12％时，假设收益年期无限，则此住房

某人拥有一套住房，若出租，则年租赁净收入为2万元。若其拟出售此住房，并要求年收益率为12％时，假设收益年期无限，则此住房的净销售收入应为（　）万元。A．14．5

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