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共用题干 A Great Quake Coming?Everyone who lives in San Francisco knows that ear...

admin2020-12-24  3
问题 共用题干
A Great Quake Coming?

Everyone who lives in San Francisco knows that earthquakes are common in the Bay Area一and they
can be devastating. In 1906,for example,a major quake destroyed about 28,000 buildings and killed
hundreds,perhaps thousands of people.Residents now wonder when the next"Big One"will strike.It's
bound to happen someday. At least seven active fault（断层）lines run through the San Francisco area. Faults
are places where pieces of Earth'S crust（地壳）slide past each other.When these pieces slip,the ground
shakes.
To prepare for that day,scientists are using new techniques to reanalyze the 1906 earthquake and pre-
diet how bad the damage might be when the next one happens.
One new finding about the 1906 earthquake is that the San Andreas fault split apart faster than scientists
had assumed at the time. During small earthquakes,faults rupture（断裂）at about 2.7 kilometers per second.
During bigger quakes,however.ruptures can happen at rates faster than 3.5 kilometers per second.
At such high speeds,massive amounts of pressure build up,generating underground waves that can
cause more damage than the quake itself. Lucky for San Francisco , these pressure pulses（脉冲）traveled
away from the city during the 1906 event.As bad as the damage was,it could have been far worse.
Looking ahead,scientists are trying to predict when the next major quake will occur. Records show that
earthquakes were common before 1906.Since then,the area has been relatively quiet.Patterns in the data,
however,suggest that the probability of a major earthquake striking the Bay Area before 2032 is at least 62
percent.
New buildings in San Francisco are quite safe in case of future quakes.Still,more than S4 percent of the
city’s buildings are old and weak.Analyses suggest that another massive earthquake would cause extensive
damage.
People who live there today tend to feel safe because San Francisco has remained pretty quiet for a
while.According to the new research,however,it's not a matter of"if" the Rig One will hit.It',just a mat-
ter of when.
选项 Earthquakes rarely happened in San Francisco before 1906.
A:Right
B:Wrong
C:Not mentioned
答案B
解析短文第一段的倒数第兰句提到至少有7条地质断层线穿越旧金山。
短文虽然说旧金山大地震的破坏力非常大，但没有明确指出其程度是美国历史之最。
从第兰段最后一句话可知答案。
第五段的第二句话提到1906年前地震频繁。
倒数第二段提到：城里超过84％的建筑是旧的、不坚固的。所以旧金山并没有为地震做好准备。
第五段的最后一句话说科学家们顶测地震发生的概率荃少为62%，但是这并不意味着 科学家们就能预测出准确的时间，最后一段也只说明这是个时间问题，而没有说出具体时间。
短文末尾提到：问题已不再是“是否”将会发生大地震，而是“什么时候”会发生。第3部分：概括大意与完成句子
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