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【判断题】
软硬岩层互层，受到顺层挤压时，硬岩层难以发生流动，形成平行褶皱。软岩层易于流动，常形成顶薄褶皱。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】左、右心室收缩时，______和______关闭，______和______开放；左、右心室舒张时，______和______关闭，______和______开放。
【单选题】听力原文： The British enjoy the family outing. Most people choose well-known beauty spots, or seaside beaches, where they are often so crowded together that you cannot see the sand. Others choose a lonely...
A.
A metropolitan city
B.
Seaside beaches
C.
A mountainous area
D.
Beautiful lakes
【单选题】听力原文：M: Excuse me ,can you tell me the way to the sleeping Beauty Castle? W: Yes, Go straight ahead. It’s about four hundred yards down this What's the relationship between the two people?
A.
Friends.
B.
Strangers.
C.
Classmates.
【简答题】右心室收缩时，______关闭，______开放，血液射入______。
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