请教OG-新增17- (17/17)即大全Passage 117

fifiliang

    

Passage 117 (17/17)

    

 (The following is based on
material written in 1996.)

    

The Montreal Protocol on Substances that Deplete the
Ozone Layer, signed in 1987 by more than 150 nations, has attained its
short-term goals: it has decreased the rate of increase in amounts of most
ozone-depleting chemicals reaching the atmosphere and has even reduced the
atmospheric levels of some of them. The projection that the ozone layer will
substantially recover from ozone depletion by 2050 is based on the assumption
that the protocol’s regulations will be strictly followed. Yet there is
considerable evidence of violations, particularly in the form of the release of
ozone-depleting chlorofluorocarbons (CFC’s), which are commonly used in the
refrigeration, heating, and air conditioning industries. These violations
reflect industry attitudes; for example, in the United States, 48 percents of
respondents in a recent survey of subscribers to Air Conditioning, Heating, and Refrigeration News, an industry
trade journal, said that they did not believe that CFC’s damage the ozone
layer. Moreover, some in the industry apparently do not want to pay for CFC
substitutes, which can run five times the cost of CFC’s. Consequently, a black
market in imported illicit CFC’s has grown. Estimates of the contraband CFC
trade range from 10,000 to 22,000 tons a year, with most of the CFC’s
originating in India and China, whose agreements under the Protocol still allow
them to produce CFC’s. In fact, the United States Customs Service reports that
CFC-12 is a contraband problem second only to illicit drugs.

    

283.
            According to the passage, which of the
following best describes most ozone-depleting chemicals in 1996 as compared to
those in 1987?

    

(A) The levels of such chemicals in the atmosphere had
decreased.

    

(B) The number of such chemicals that reached the
atmosphere had declined.

    

(C) The amounts of such chemicals released had increased
but the amounts that reached the atmosphere had decreased.

    

(D) The rate of increase in amounts of such chemicals
reaching the atmosphere had decreased.（D）

    

(E) The rate at which such chemicals were being reduced
in the atmosphere had slowed.

答案d我选c为什么错呢？

    

284.
            The author of the passage compares the
smuggling of CFC’s to the illicit drug trade most likely for which of the
following reasons?

    

(A) To qualify a previous claim

    

(B) To emphasize the extent of a problem

    

(C) To provide an explanation for an earlier assertion

    

(D) To suggest that the illicit CFC trade, likely the
illicit drug trade, will continue to increase（B）

    

(E) To suggest that the consequences of a relatively
little-known problem are as serious as those of a well-known one

答案b我选e，e为啥不对呢？