The earthquake of 26 th December 2004 resulted in one of the worst natural disasters in living memory. It was a【C1】______underwa

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问题     The earthquake of 26 th December 2004 resulted in one of the worst natural disasters in living memory. It was a【C1】______underwater quake and occurred in the Indian Ocean. It【C2】______coastlines, communities and brought death to many people.
    Why do earthquakes happen?
    The surface of the earth has not always looked as it does today; it is moving【C3】______ (although very slowly) and has done so for billions of years. This is one【C4】______of earthquakes, when one section of the earth (tectonic plate) 【C5】______another. Scientists can predict where but not【C6】______this might happen and the area between plates is called a fault line. On one fault line in Kobe, Japan in 1923 over 200, 000 people were killed. 【C7】______, earthquakes do not always happen on fault lines, 【C8】______is why they are so dangerous and 【C9】______.
    Where do volcanoes happen?
    Volcanoes happen where the earth’s【C10】______is thin: lava, dust and gases【C11】______from beneath the earth. They can rise into a huge cone shape like a mountain and erupt, 【C12】______they can be so violent【C13】______they just explode directly from the earth with no warning. There are 1511 "【C14】______" volcanoes in the world. This means that they may【C15】______be dangerous. In 1985 the Colombian volcano Nevado del Ruiz erupted. The lava melted a glacier and sent tones of mud【C16】______the town below. Twenty thousand people died.
    Natural disasters like volcanic eruptions are often unpredictable. We regularly do not know when they【C17】______happen, or【C18】______where they will happen. In the future, scientists may be able to watch and predict【C19】______before they happen. This could【C20】______many lives.
【C4】

选项 A、source
B、reason
C、movement
D、cause

答案D

解析 第二段的问句提示下文将会解释地震发生的成因,该句的后半句又描述了地震发生的条件,因而此处的意思应为“地震的原因”,reason与cause都有“原因”的意思,注意看两者区别:reason通常指产生某种行为或想法的理由,而cause通常指导致某一事件发生的起因,着重指产生某事物或造成某事发生的原因,往往指造成不好的影响。此外,reason常和for连用,而cause常和of连用,所以本题选[D]。[A]source“来源”和[C]movement“运动”,都不合语义,所以排除。
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