首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Acid ran leads to fish mortality. Many species of fish cannot survive in aquatic environments there the pH is below 5.0. If the
Acid ran leads to fish mortality. Many species of fish cannot survive in aquatic environments there the pH is below 5.0. If the
admin
2013-01-12
31
问题
Acid ran leads to fish mortality. Many species of fish cannot survive in aquatic environments there 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 【C2】______ becomes extinct. Approximately 20 percent of the lakes in Scandinavia are without fish. Moreover, in Nova Scotia the 【C3】______ salmon industry may be threatened by the decrease of salmon in rivers and streams. The impact is also 【C4】______ in the waters of Ontario and Quebec, where fish populations are 【C5】______ the decline.
What potential remedies exist for the acid rain 【C6】______? The experts disagree. Some say new environmental laws should be 【C7】______ 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 【C8】______ to prevent it. 【C9】______, all agree that if the consumption of fossil fuel were reduced, we would have less of a problem. Another 【C10】______ is that special scrubbers could be installed in smokestacks to remove a good 【C11】______ of the pollutants before they get into the atmosphere. Other ideas even include breeding more 【C12】______ fish. And research suggests that spreading lime into lakes may be effective in 【C13】______ acidity. In conclusion, it is clear that if we truly want to reduce the impact of acid rain, a 【C14】______ of remedies and international cooperation must be explored. It is a sad fact that acid rain probably could have been avoided if we 【C15】______ what we know now.
【C15】______
选项
A、know
B、knew
C、had known
D、have known
答案
C
解析
对过去事实的虚拟,主句是could have been avoided,从句应该用过去完成时(had done),所以C是正确答案。
转载请注明原文地址:https://jikaoti.com/ti/dwHYFFFM
0
考博英语
相关试题推荐
Inoursocietytherazorofnecessitycutsclose.Youmustmakeabucktosurvivetheday.Youmustworktomakeabuck.Thejob
Inoursocietytherazorofnecessitycutsclose.Youmustmakeabucktosurvivetheday.Youmustworktomakeabuck.Thejob
Inoursocietytherazorofnecessitycutsclose.Youmustmakeabucktosurvivetheday.Youmustworktomakeabuck.Thejob
Inoursocietytherazorofnecessitycutsclose.Youmustmakeabucktosurvivetheday.Youmustworktomakeabuck.Thejob
Inoursocietytherazorofnecessitycutsclose.Youmustmakeabucktosurvivetheday.Youmustworktomakeabuck.Thejob
Militaryordersare______andcannotbedisobeyed.
Indeed,______maydevelopinbehavioroccurringbetweendifferentspecies.
Thepossibilitythattheexplosionwascausedbysabotagecannotbe______.
Inordertosurvivenowand______inthefuture,alltheworkingstaffmustconstantlycreatenewideasforeveryaspectofyou
随机试题
试述律师担任刑事辩护人所依法享有的权利。
周期性变化不受性激素影响的是
患者,女,55岁。因暑天乘凉饮冷,出现恶寒发热,头痛脘痞,恶心、呕吐频作,食少泄泻,舌苔腻脉濡。治疗应首选
根据《合同法》的规定,下列合同订立时应当采用书面形式的是()。
下列关于国家风险评估指标中比例指标的说法,不正确的有()。
()为福建省最大河流。
讨论法和谈话法是初中思想品德课教学的最基本的教学方法。
根据下面的新闻稿件撰写一篇评论,字数800字左右。(电子科技大学,2015)汶川“抗震小英雄’’诈骗约46万自投罗网变成阶下囚记者从成都高新区人民法院了解到,汶川抗震小英雄雷楚年涉嫌诈骗、伪造国家机关印章、伪造公司印章案,2013年11
王刚是北京某公司的一名职工,现有一篇文字资料需要他进行整理,资料保存在“Word素材文件.docx”中。请打开该文档并按下列要求帮其完成排版及保存操作:保存“Word.docx”文件,并根据文档内容另行生成一份同名的PDF文档。
Thegovernmentdecidedtolakea______actiontoslrengrhenthemarketmanagement(2007年清华大学考博试题)
最新回复
(
0
)