Earthquakes are probably one of the most frightening and destructive happenings of nature that man experiences. They have caused

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问题     Earthquakes are probably one of the most frightening and
destructive happenings of nature that man experiences. They
have caused the death of many human beings, much suffering
and greatly damage to property. Today, the study of earthquake            【S1】________.
has grown greatly with scientists all over the world                      【S2】________.
investigating the causes of earthquakes. Scientists hope that their
studies will improve ways of predicting earthquakes and also
develop ways to reduce its destructive effects.                           【S3】________.
    The scientific study of earthquakes is fairly new. Until the
18th century many factual descriptions of earthquakes were                【S4】________.
recorded. In general, people did not understand the cause of
earthquakes. Many believe they were a punishment from God                 【S5】________.
and a warning for them to repent (忏悔). One early theory was
that earthquakes were caused by air rushed out caves deep in the          【S6】________.
interior of the earth.
    On Nov. 1, 1755, a serious earthquake occurred near Lisbon,
Portugal. Shocks from the quake had felt in many parts of the world.      【S7】________.
After the quake, Portuguese priests were asked to observe and to
make written records. These records were the first system attempt         【S8】________.
to document the effects of an earthquake. Since that time, detailed
records have been kept to almost every major earthquakes.                 【S9】________.
    Currently, scientists are making studies to enable them to
predict earthquakes. But at the present time, the ability to predict the
time, place, and size of earthquakes are very limited.                    【S10】________.
【S5】

选项

答案believe→believed

解析 当时人们相信……,根据上下文应用一般过去时。时态错误。
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