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  3. Seismologists studying the earthquake that stuck northern California in October 1989 are still investigating some of its mysteri

Seismologists studying the earthquake that stuck northern California in October 1989 are still investigating some of its mysteri

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问题 Seismologists studying the earthquake that stuck northern California in October 1989 are still investigating some of its mysteries: the unexpected power of the seismic waves, the upward thrust that threw one man straight into the air, and the strange electromagnets signals detected hours before the temblor.
选项 A、the upward thrust that threw one man straight into the air, and strange electromagnets signals detected hour before the temblor
B、the upward thrust that threw one man straight into the air, and strange electromagnetic signals were detected hours before the temblor
C、the upward thrust threw one man straight into the air, and hours before the temblor strange electromagnetic signals were detected
D、one man was thrown straight into the air by the upward thrust, and hours before the temblor strange electromagnetic signals were detected
E、one man who was thrown straight into the air by the upward thrust,and strange electromagnetic signals that were detected hours before the temblor
答案A
解析 划线部分与前面的the unexpected power构成一组平行的名词短语对mysteries做解释。A中是一组并列的名词词组，满足对称要求。在B中，and之后是一个句子，破坏对称性。C中逗号前是句子，逗号后的内容改变了句子原意。D中逗号前是句子，逗号后的内容改变句子意思。E中逗号前的内容改变原意(中心词由thrust换为了one man)，逗号后用从句替换A中的过去分词短语，不够简洁。
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