The earthquake of 26 th December 2004 resulted in one of the worst natural d

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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. [br] 【C6】

选项 A、how
B、why
C、when
D、what

答案 C

解析该句说，科学家可以预测地震发生的地点，但不能预测…。[A]how和[B]why可首先排除，因为科学家已经知道地震发生的过程和原理，无需预测。文章末尾提到，将来科学家或许能够在地震发生前作出预测，提示了预测的一项内容，即时间，故本题选[C]when.

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