VI. Read the passage and choose the correct answer A, B, C, or D for each question.
Son Doong Cave
Located in the limestone mountains of Phong Nha - Ke Bang National Park. Son Doong Cave was first found in 1991 by Ho Khanh, a local man. In 2009, the cave was explored and published by a group of scientists from the British Cave Research Association. Son Doong Cave was formed from 2 to 5 million years ago when the river flowed through the limestone mountain area and was buried. The water eroded limestone and created an underground tunnel. In soft limestone areas, the collapse of the tunnel ceiling formed large holes which became giant domes afterward. The cave is about 200m high, 200m wide, and at least 8 5km long. Especially, Son Doong consists of two entrances, which are unique among explored caves in Phong Nha - Ke Bang National Park. Exploring the cave, visitors were surprised with the spectacular scenery of numerous stalactites of which some giant stalagmites are more than 70 meters high. Deep inside the cave exists a grandiose tropical jungle called the “Garden of Eden" by the explorers. The jungle is home to a diversified system of fauna and flora. Besides, the cave possesses a 2.5-kilometer underground river. Not far from the “Garden of Eden” lies an enormous “pearl collection” consisting of tens of thousands of small stone pieces in dry ponds, contributing to the magnificent beauty of the cave.
1. The reason why Son Doong Cave was formed is that ________.
A. an underground tunnel was buried in the area B. the limestone areas were soft
C.it only happened from 2 to 5 million years ago D. the river was buried in the limestone mountains
2. The most important feature of “Garden of Eden” is ____________.
A.the biodiversity B. giant stalagmites
C. the biggest length D. the river below
3. We can infer from the passage that ________.
A.tunnels and giant domes were formed at the same time
B. “pearl collection” contains a lot of precious stones
C.we can live in the cave with the air and water
D. “Garden of Eden” is in the underground river
4. All of the following are the wonderful features of Son Doong Cave EXCEPT ________.
A. tropical jungle inside with the biodiversity
B.spectacular scenery of numerous stalactites and stalagmites
C.a river flowing over 2.5 kilometers along the cave
D.the big sizes of the cave and the giant domes
5. 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
