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  3. The author believes that ______. That Africa and South America were once joined can be deduced from the fact that ______.

The author believes that ______. That Africa and South America were once joined can be deduced from the fact that ______.

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问题 The author believes that ______.
That Africa and South America were once joined can be deduced from the fact that ______.
选项 A、the two continents are still moving in opposite directions
B、they have been found to share certain geological features
C、the African plates has been stable, for 30 million years
D、over 100 hot spots are scattered all around the globe
答案B
解析 这是一道事实推断题。是什么事实使人们推断：非洲与南美洲曾经相连?作者在第二段第三句中是这样解释的：那些远隔大洋却相互吻合的海岸线，以及一些相同的地质特征提醒着人们：这两个大陆曾经在哪些地方相连。因此，选项"人们发现它们具有一些相同的地质特征"正是这一推断所依据的事实。其它选项所叙述的事实均不能使人做出上面的推断。
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