四六级

　　英语六级听力改革后，考试题型变化较大，包括长对话、听力篇章和讲座，大家平时要有针对性的加强练习。本文是小编为大家提供的英语六级听力mp3在线听第8套短文1，希望对大家更好地进行2017年6月英语六级备考有帮助。

英语六级听力mp3在线听第8套短文1.mp3

　　Questions 9 to 12 are based on the passage you have just heard.

　　9

　　A.Seismologists haven't developed any ways to predict earthquake.

　　B.Scientists can foretell the specific time and location of an earthquake.

　　C.The earthquake prediction helps people prevent it happening.

　　D.The earthquake prediction can only locate potential areas of danger.

　　10

　　A.Seismic activity.

　　B.An opening in the Earth's crust.

　　C.Crack in the Earth's core.

　　D.A lot of noise before an earthquake.

　　11

　　A.They termed the second prediction model.

　　B.They observed ground tilt before earthquakes.

　　C.They learned lessons from major earthquakes.

　　D.They evacuated people from the city in time.

　　12

　　A.He believes the third model will be combined with the first one.

　　B.He couldn't agree with the second model any more.

　　C.He has some reservations about all the three models.

　　D.He obviously doesn't favor any of the three models at all.

　　Passage One

　　Now, you've been reading articles about the tremendous damage done to life and property by earthquakes. That's why seismologists have been working so hard to develop methods of earthquake prediction. (9) We can now predict earthquake fairly well but the predictions only locate potential areas of danger. They don't predict the specific time and location at which an earthquake is likely to occur. Today I want to introduce you to three prediction models that have been developed.

　　(l0) The first prediction model looks along earthquake faults, those cracks in the Earth's crust, to find what are known as seismic gaps. Seismic gaps are places where the fault has shown little or no seismic activity for a long time. This theory postulates that such places are due for a major shock.

　　The second model relies on phenomena—like ground tilt. (11) Using long cylindrical tubes containing water, observers noted that ground tilt tended to occur before major earthquakes. That led them to correctly predict the big Haicheng (HI CHUNG) quake of 1975—the first successful earthquake prediction scientists have ever made. A million people were evacuated from that Chinese city before the earthquake struck. Unfortunately, this method hasn't worked consistently, so we can't say it's been perfected.

　　The third model is based on the theory that major earthquakes closely follow a series of minor ones. Starting with the measurements and timing of the smaller quakes, a complex formula calculates the "times of increased probability" of a much larger quake. Right now, this method, like the first method, cannot predict specific time and places, but that may change as it is further developed.

　　(12) For the moment, none of these models can predict with reasonable levels of confidence.

　　9. What can we know about the earthquake prediction according to the speaker?

　　10. What is the earthquake fault?

　　11. Why could the scientists correctly predict Haicheng quake of 1975?

　　12. What is the speaker's attitude toward the three prediction models?

　　参考答案：

　　【小题9】D

　　【小题10】B

　　【小题11】B

　　【小题12】C

　　习题解析：

　　【小题9】短文开头部分提到，地震学家一直致力于大力发展地震预报方法，已经可以很好地预测地震，但只能找到潜在的危险地区，不可预测地震发生的具体时间和地点。选项 D 与原文相符，故选 D。

　　【小题10】短文在提到地震断层的时候，紧随其后就进行了解释，即地壳裂缝，故选 B。

　　【小题11】在解释第二种预测模型时，观察家指出，地面倾斜往往会发生在大地震之前。正因为如此，科学家于 1975年第一次成功预报了地震。选项 B 与原文相符，故选 B。

　　【小题12】短文最后提出，就目前而言，没有哪种模型可以很有信心地，合理地做出地震预测。选项 C 表明作者持有保留态度，故选 C。

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