Official 16 Lec 1
答题结果:0/6
答题时间:0''
Question 5 of 6
What can be inferred from be fact that Lechuguilla Cave is no longer forming?

A.

The cave has stopped attracting visitors

B.

The cave no longer contains any limestone

C.

The air in the cave is safer to breathe now than it was in the past

D.

Gypsum deposits inside the cave are growing thicker

我的答案:

正确答案:C

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