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土壤修复技术根据是否将土壤挖掘出来，可以分为（）和（）两类，针对后者，根据处理工艺是否在污染现场又可以分为：现场（onsite）/非现场（offsite）。一般的蒸气抽提属于（）技术。它是一种（）的技术，主要是用来去除（挥发性或半挥发性）的污染物。植物修复修复污染土壤的作用机理有（植物提取），（植物降解）、（植物稳定）、（植物挥发）。土壤生物修复技术是利用微生物来降解土壤或地下水中的（可生物降解的）污染物的修复技术。
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【单选题】Say that a monopolist is currently operating on the inelastic region of its demand curve. To maximize its profits, it should:
A.
raise its prices.
B.
lower its prices.
C.
maintain its current price.
D.
either raise or lower its prices, depending on how high its marginal cost curve is.
【单选题】I bought ____ of the three books because I thought they were not suitable for me to read. A. all B. both C. either D. none
A.
B.
C.
D.
D
【单选题】Because postage rates are rising, Home Decorator magazine plans to maximize its profits by reducing by one half the number of issues it publishes each year. The quality of articles, the number of arti...
A.
With the new postage rates, a typical issue under the proposed plan would cost about one-third more to mail than a typical current issue would.
B.
The majority of the magazine's subscribers are less concerned about a possible reduction in the quantity of the magazine's articles than about a possible loss of the current high quality of its articles.
C.
Many of the magazine's long-time subscribers would continue their subscriptions even if the subscription price were increased.
D.
Most of the advertisers that purchase advertising space in the magazine will continue to spend the same amount on advertising per issue as they have in the past.
E.
Production costs for the magazine are expected to remain stable.
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