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Acid rain leads to fish mortality. Many species of fish cannot survive in aquatic environments where the pH is below 5. 0. If th
Acid rain leads to fish mortality. Many species of fish cannot survive in aquatic environments where the pH is below 5. 0. If th
admin
2017-03-23
23
问题
Acid rain leads to fish mortality. Many species of fish cannot survive in aquatic environments where the pH is below 5. 0. If the water is too acid, the gill systems of many kinds of fish can be damaged.【C1】______, the acid alters the blood chemistry of all fish. As a result, the fish population in an acidic environment decreases or becomes extinct. Approximately 20 percent of the lakes in Scandinavia are without fish. Moreover, in Nova Scotia the【C2】______ salmon industry may be threatened by the decrease of salmon in rivers and streams. The impact is also considerable in the waters of Ontario and Quebec, where fish populations are【C3】______ the decline.
What potential remedies exist for the acid rain issue? The experts disagree. Some say new environmental laws should be【C4】______ to control the emission of pollutants in the atmosphere. Some say that if we had known how serious acid rain was, we would have planned better to prevent it.【C5】______, all agree that if the consumption of fossil fuel were reduced, we would have less of a problem. Another【C6】______ is that special scrubbers could be installed in smokestacks to remove a good【C7】______ of the pollutants before they get into the atmosphere. Other ideas even include breeding more tolerant fish. And research suggests that spreading lime into lakes may be effective in【C8】______ acidity. In conclusion, it is clear that if we truly want to reduce the impact of acid rain, a【C9】______ of remedies and international cooperation must be explored. It is a sad fact that acid rain probably could have been avoided if we【C10】______ what we know now.
【C1】
选项
A、Likewise
B、Besides
C、Thus
D、Otherwise
答案
B
解析
此处的下句对上句是补充,B项Besides“此外”符合文意和结构的要求。其他三个选项中,Likewise意为“同样地,照样地,又,也”,表示上下句的同类关系;Thus意为“因而,从而,这样,如此”,表示上下句的因果关系;Otherwise意为“另外,否则,不同地,别的方式”,表示上下句的反义关系。
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在职申硕(同等学力)英语
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