Câu hỏi :

From the passage, we know that ______.

A. there is a street inside Son Doong Cave

B. the cave is always covered with rain water

C. few tourists want to come to the cave

D. tourists need permission to explore the cave

* Đáp án

D

* Hướng dẫn giải

Dẫn chứng: Permits are now required to access the cave and are made available on a limited basis. Only 500 permits were issued for the 2015 season, which runs from February to August.

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