5．The water in the river has colour and smell because it is getting _______．

　 A．more and more　　　　　　　　　 B．less and less

　 C．cleaner and cleaner　　　　　　 D．dirtier and dirtier

KEY: 1．C　　　 2．A　　　　 3．B　　　　 4．A　　　　 5．D

E

“Cool”is a word with many meanings．Its old meaning is used to express a temperature that is a little bit cold．As the world has changed，the word has had many different meaning．

“Cool”can be used to express feelings of interest in almost anything．

When you see a famous car in the street，maybe you will say，“It's cool．”You may think，“He's so cool，”when you see your favourite footballer．

We all maximize(扩大) the meaning of“cool”．You can use it instead of many words such as “new” or “surprising”．Here's an interesting story we can use to show the way the word is used．A teacher asked her students to write about the waterfall(瀑布)they had visited．On one student's paper was Just the one sentence，“It's so cool．Maybe he thought it was the best way to show what he saw and felt．

But the story also shows a scarcity(缺乏)of words．Without “cool”，some people have no words to show the same meaning．So it is quite important to keep some credibility(可信性)．Can you think of many other words that make your life as colourful as the word “cool”？ I can．And I think they are also very cool．

4．Most of the children _______ the boy．

　 A．agreed with　　　　　　　　　　 B．wrote to

　 C．heard from　　　　　　　　　　　 D．sent for

3．A boy said，“The water in the river behind my house is always _______．”

　 A．white　　　　　 B．black　　　　 C．clean　　　　　 D．clear

2．Miss Li was telling the children what ______ was like．

　 A．water　　　　　 B．air　　　　　 C．earth　　　　　 D．weather

1．The students were having their _______ class．

　 A．English　　　　 B．Chinese　　　 C．chemistry　　　 D．maths

5．______ will make the world better．

　 A．The Great Wall　　　　　　　　　 B．Tall buildings

　 C．Great Green Walls　　　　　　　 D．Flowers and grass

KEY: 1．B　　 2．D　　 3．A　　　 4．D　　　 5．C

D

The students were having their chemistry(化学)class. Miss Li was telling the children what water was like. After that, she asked her students, “What's water?”No one spoke for a few minutes．Miss Li asked again，“Why don't you answer my question？Didn't I tell you what water is like？”

Just then a boy put up his hand and said，“Miss Li，you told us that water has no colour and no smell．But where to find such kind of water？The water in the river behind my house is always black and it has a bad smell．”Most of the children agreed With him．

“I'm sorry，children．”said the teacher，“Our water is getting dirtier and dirtier．That's a problem．

4．Trees must be grown in ______.

　 A．China　　　　　　　　　　　　　　 B．the USA

　 C．some countries　　　　　　　　　 D．every part of the world

3．The Great Green Wall in China is ______ long．

　 A．7,000 kilometers　　　　　　　　 B．1,700 kilometers

　 C．7,000 meters　　　　　　　　　　 D．400 kilometers

2．A lot of good land has gone with ______．

　 A．sand　　　　　 B．water　　　 C．wind　　　　　 D．forests

1．In 1620, about ______ the USA was covered by forests．

　 A．a third　　　 B．half　　　 C．two thirds　　　 D．a fourth