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【单选题】
听力原文：M: I'm leaving now. Do you need anything? W: Pick up a bar of soap and some ice cream for dessert, please. Where is the man probably going?A.
To a grocery.
B.
To a gas station.
C.
To a garage.
D.
To a railway station.
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【多选题】人生实践中,人们往往会遇到各种矛盾和挫折,这就需要端正人生态度。下列选项中,不正确的人生态度是( )。
A.
人生是一次冒险的游戏
B.
人生苦短,当及时享受
C.
人生就是选择,个人当为自己的行为负责
D.
人应面对现实,接受挑战
【简答题】（12分）孔雀石主要含Cu 2 (OH) 2 CO 3 ，还含少量Fe、Si的化合物。某工厂以孔雀石为主要原料制备 CuSO 4 ·5H 2 O及纳米材料G，主要步骤如下： 已知该条件下，通过调节溶液的酸碱性而使Fe 3+ 、Fe 2+ 、Cu 2 + 生成沉淀的pH 分别如下： 物质 开始沉淀时的pH 完全沉淀时的pH Fe(OH) 3 2.2 3.2 Fe(OH) 2 7.6 9.6 Cu(O...
【单选题】Which of the following best explains why a monopolist's marginal revenue is less than the sale price?
A.
To sell more units, a monopolist must increase the price on all units sold.
B.
As a monopolist expands output, its average total cost declines.
C.
When a firm has a monopoly, consumers have no choice other than to pay the price set by the monopolist.
D.
When a monopolist reduces price in order to sell more units, it must lower the price of some units that could otherwise have been sold at a higher price.
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