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  3. Nowadays, scientists still have not made huge progress on the research of earthquake because they have not fully understood what

Nowadays, scientists still have not made huge progress on the research of earthquake because they have not fully understood what

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问题 Nowadays, scientists still have not made huge progress on the research of earthquake because they have not fully understood what cause earthquakes.
In earthquake, long wave is the main source of damage because it causes the shake of ______.
选项
答案the foundations of manmade structures
解析 根据long wave定位到第四个小标题下首段末句Surface waves...because they cause the most intense vibrations．此处需填入名词性成分。接下来在第四个小标题下的第2段第2句给出了原因：This generally causes the worst damage...rocks the foundations of manmade structures。题干中的is the main source of damage与原文中的causes the worst damage属同义转述；题于中的shake(名词)“摇动，震动”与原文中的rock(动词)同义。所以rocks的宾语为本题答案。
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