The Exploding Lakes of Cameroon What comes to mind when you think of a lake? You probably imagine a pretty scene with very different. For them,lakes may mean terrible disasters. In 1984,poisonous gases exploded years later,Lake Nyos erupted A cloud of gases rolled down the hills and into the valleys and Lake Nyos and Lake Monoun are craterlakes They were formed when water not active anymore. However, poisonous gases from the center of the earth continue to flow up gases are released often because the waterturns overregularly.That is,the water from the However,in Lakes Nyos and Monoun,there is no regular turning over.No one knows the crater lakes. In fact,scientists who have studied Lakes Nyos and Monoun have found 16,000 water to turn over suddenly,the gases escape in a violent explosion. to escape disaster. Now scientists from the United States,France,and Cameroon have found a the middle of the lake,with one end of the pipe near the bottom and the other end in the air.Near when the gas pressure gets too high,the holes are opened and some of the gas-filled water shoots less likely.However, the scientists are not sure that one pipe will be enough to prevent explosions.They hope to put in others soon and they plan to install a similar pipe and a computer system at Lake Monoun as well. warning systems at both lakes. If the gas pressure rises to a dangerous level,computers will set have time to escape from the dangerous gases. A Water will flow down the hills C A strong wind will rise from the lakes 42 Which of the following statements about Lake Nyos and Lake Monoun is true? B They are at the top of two active volcanoes. D Water in them turns over regularly. A the gases rise to the top and mix with air. C scientists have put in a computer system. 44 A team of scientists has B identified the gases at the bottom of the lake D removed all dangerous gases from the lakes A Scientists are planning to install pipes in all crater lakes. C Explosion disasters could be avoided in the future
与in the past连用的时态
时态详解:过去将来时
过去进行时用法五注意
独立主格
一般将来时用法说明
将来进行时用法说明
现在完成时用法详说
独立主格用作伴随状语
分词独立主格结构的理解技巧
一般现在时表过去的用法
时态详解:现在进行时
现在进行时用法详解
独立主格结构介词使用的问题
一般过去时用法说明
时态详解:现在完成时
过去进行时的用法小结
由“名词(代词)+形容词”构成的独立主格
时态详解:一般过去时
时态详解:现在完成进行时
时态详解:一般将来时
由“名词(代词)+副词”构成的独立主格
独立主格结构考题小练(有详解)
将来完成时用法解说
过去将来时的用法说明
几种将来时间表示法的比较
独立主格用作定语
从一道高考题看独立主格结构的用法
时态详解:过去进行时
关于分词的独立主格结构
一般现在时表将来的规律
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