41 What will happen when Lake Nyos and Lake Monoun explode?
B Poisonous gases will be released suddenly.
D The volcanoes will come to life.
A They were formed in 1984.
C They are not like most other crater lakes.
43 Lake Nyos and Lake Monoun explode because
B people from the villages turn over the water.
D they have more gases trapped at the bottom than other crater lakes
A erected a pressure-releasing pipe in the lake
C built a beautiful fountain near the lakes
45 What do we learn from the last paragraph?
B Scientists still do not know how to prevent gas explosions
D Warning systems have been set up in the villages nearby.
41 B 该题问的是Nyos和Monoun两湖喷发时会出现什么情况?第一段第五句提到,Monoun喷发时有毒气体随之而出。两年后,Nyos湖喷发时也出现类似情况。故B为答案。
43 D 题句的意思是:Nyos和Monoun两湖发生喷发的原因是什么?前三个选项均与原文意思不符,答案见第三段第二句。
45 c 本题问的是在文章最后一段我们了解到了什么?文章最后一段主要讲的是在所有的湖里竖起缓解湖底气压的管子后,就不会有危险。故选项c为正确答案。
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