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问题 单项选择题

女性，40岁。心悸气促已数年，近来症状加重，并伴双下肢浮肿，是风心病合并（）

A．风湿活动

B．肺部感染

C．上呼吸道感染

D．周围循环衰竭

E．充血性心力衰竭

答案

参考答案：E

解析：

下肢水肿、心悸，应首先考虑右心衰。

单项选择题

In essence, all rent-control policies involve specifying a maximum rent that a landlord may charge for a dwelling. The rationale for controlling rents is to protect tenants in situations where limited supply will cause rents to rise sharply in the face of increased demand. However, although rent control may help some tenants in the short run, it affects the rental housing market adversely in the long run because landlords become reluctant to maintain the quality of their existing properties and even more reluctant to have additional rentalhousing units built.
Which one of the following, if true, best explains the landlords’ reluctance described above ？（）

A．Tenants prefer low-quality accommodations with rent control to high-quality accommodations without it.

B．Rent control makes it very difficult for landlords to achieve reasonable returns on any investments in maintenance or in new construction.

C．Rent control is a common practice even though it does nothing to alleviate shortages in rental housing.

D．Rent control is generally introduced for political reasons and it takes political action to have it lifted again.

E．Tenants prefer rent control to the alternative of receiving direct government subsidies toward rents they cannot afford.
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单项选择题

在Excel工作表行列标题交叉处按钮的作用是______。

A．选中行号

B．选中列标

C．选中整个工作表

D．无作用
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