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【单选题】
一般认为，岩浆的主要发源地是（）。
A.
地核
B.
下地幔
C.
地壳
D.
软流圈（层）
题目标签：岩浆
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【单选题】Earthquakes An earthquake is one of the most terrifying phenomena that nature can dish up. We generally think of the ground we stand on as "rock-solid" and completely stable. An earthquake can shatter...
A.
More than 3 million.
B.
1.5 million.
C.
About 8,000.
D.
11.
相关题目：
【单选题】Earthquakes An earthquake is one of the most terrifying phenomena that nature can dish up. We generally think of the ground we stand on as "rock-solid" and completely stable. An earthquake can shatter...
A.
More than 3 million.
B.
1.5 million.
C.
About 8,000.
D.
11.
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