What is Alvin? In what aspects are the new HOV and Alvin different?

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问题 What is Alvin?
In what aspects are the new HOV and Alvin different?

选项 A、Offering better views.
B、Speed.
C、Size.
D、Both A and Ｂ.

答案D

解析第三段最后两句告诉我们，Alvin只有三个窗户，而HOV有五个。最后一段告诉我们，两艘潜水装置的上下活动速度和行进速度有所差别。所以D是正确选择。

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