The Yellow River ranks the third longest in Asia and the sixth longest in the world. The word “yellow” describes the muddy water of the river. The Yellow River，one of several rivers for China to live on，originates from Qinghai，flows through nine provinces, and finally pours into the Bohai Sea. The river basin is not only the birthplace of ancient Chinese civilization，but also the most prosperous region in the early history of China. However,due to the frequent devastating floods, it has caused many disasters. In the past few decades,the government has taken various measures to prevent disasters.
1 B The test driver made a wrong judgement
2 D They have generally done quite well.
3 A He works at a national park.
4 B They were making a lot of noise.
5 A The discovery of a new species of snake.
6 C A snake crawled onto his head in his sleep.
7 D From its colour.
8 A The security check takes time.
9 B By credit card.
10 A Give him a receipt.
11 D Posting a comment on the hotel’s webpage.
12 C He has stopped making terrible faces.
13 D Warn him of danger by making up a story.
14 A They could break pp’s legs.
15 B One would have to shave their head to remove a bat in their hair.
16 C Everything seemed to be changing.
17 A Meeting people.
18 D He was a young student in the 1960s.