Which statement is NOT true about Son Doong Cave?

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Which statement is NOT true about Son Doong Cave?

Tourists can explore Son Doong Cave daily throughout the year.

The cave was formed about 2 to 5 million years ago.

It was formed by river water eroding away the limestone underneath the mountain.

Some of the stalagmites in Son Doong Cave are about 70 metres tall.

Giải thích

Đáp án đúng là: A

Dẫn chứng ở câu “Only 500 permits were issued for the 2015 season, which runs from February to August.”

Dịch: Chỉ có 500 giấy phép được cấp cho mùa 2015, kéo dài từ tháng Hai đến tháng Tám.