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问题 多选题

二氧化碳的增多，影响气候，下列哪些人类活动增加了空气中的二氧化碳？（　　）

A．大量开采煤，以煤为主要燃料

B．汽车数量的激增，大量使用汽油

C．植树造林，绿化环境

D．大量使用水电能、太阳能

答案

AB

单项选择题

Kim Lee manages a variety of accounts at Superior Investments. Some are permitted to invest in tax - exempt issues only; others may not invest in a stock unless it pays dividends. Lee is researching a biotech firm specializing in the analysis of "mad cow" disease. While touring company facilities and meeting with management, she learns that they believe they may have found a way to reverse the disease. Moreover, one manager conjectured, "Suppose that we reversed the disease in someone who didn’t even have it We might then be able to boost that individual’s IQ into the stratosphere ! " Lee returns to her office and buys shares for all accounts under her supervision. This action is:（）

A. a violation of the Standard concerning appropriateness and suitability of investment actions.

B. appropriate given the obvious potential of the therapy.

C. only permissible if the account holders are contacted first before the shares are purchased.
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多项选择题

以下可以用于防烟分区的挡烟设施是（）。

A.防火墙

B.防火卷帘

C.从顶棚下凸出不小于500mm的梁

D.挡烟垂壁

E.隔墙
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