Read the passage, and choose the correct answer A,...

Câu hỏi: Read the passage, and choose the correct answer A, B, C or D for each question.The thing that makes it different from other caves in Phong Nha - Ke Bang National Park is ..........

A. stalactites and stalagmites

B. the two entrances into the cave

C. its discovery by a local man

D. large holes in the ceiling