图中甲地多见石芽、溶洞等地形,推断未知岩层应为
A.页岩
B.板岩
C.石灰岩
D.花岗岩
上一篇 6l. From the third paragraph, we know that __A. oxen are no more important today than in t
下一篇 A.easier B.better C.faster D.worse
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