Every year earthquakes are responsible for a large number of deaths and a【36】amount of destruction in various parts of the world

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问题     Every year earthquakes are responsible for a large number of deaths and a【36】amount of destruction in various parts of the world. Most of these damaging earthquakes occur either in a narrow belt which【37】the Pacific Ocean or in a line which【38】from Burma to the Alps in Europe. Some of the destruction is directly caused by the quake itself. An example of this is the【39】of buildings as a result of the quake itself. Other damage results from landslides or major fires which are【40】by the quake.
    There are about a million quakes a year.【41】, however, not all of them are destructive. The【42】of an earthquake is measured on the Richter Scale, which goes from 0 upward. The highest scale recorded to date is 8.9. Major damage generally occurs from quakes【43】upwards from 6.0.
    The actual cause of the quake itself is the breaking of rocks at or below the earth’s surface. This is produced by pressure【44】of the earth’s crust (地壳) and continental drift.
    In order to limit the damage and【45】. Special instruments are used to help people record, for example, shaking of the earth. Scientists are trying【46】.
  
Every year earthquakes are responsible for a large number of deaths and a (36) vast amount of destruction in various parts of the world.  Most of these damaging earthquakes occur either in a narrow belt which (37) surrounds the Pacific Ocean or in a line which (38) extends from Burma to the Alps in Europe. Some of the destruction is directly caused by the quake itself.  An example of this is the (39) collapse of buildings as a result of the quake itself.  Other damage results from landslides or major fires which are (40) initiated by the quake.
    There are about a million quakes a year. (41) Fortunately,  however, not all of them are destructive.  The (42) intensity of an earthquake is measured on the Richter Scale, which goes from 0 upward.  The highest scale recorded to date is 8.9.  Major damage generally occurs from quakes (43) ranging upwards from 6.0.
    The actual cause of the quake itself is the breaking of rocks at or below the earth’s surface.  This is produced by pressure (44) which scientists believe may be due to a number of reasons, two of which are the expansion and contraction of the earth’s crust (地壳) and continental drift.
    In order to limit the damage and (45) to prevent some of the suffering resulting from earthquakes, scientists are working on ways to enable accurate prediction. Special instruments are used to help people record, for example,  shaking of the earth.  Scientists are trying (46) to find methods that will enable them to indicate the exact time, location and size of an earthquake.

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答案Fortunately

解析 一个位于句首、后接逗号的词往往是副词或者连词,此处为评论性副词。Fortunately“幸运的是”,注意字母组合or。
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