1. This novel is really ________ useful book for me，because it has given me a lot of courage to overcome difficulties.

A．an

B．a

C．the

D．/

2. How ________Jack is！He hasn't fed the dog for two days.

A．cruel	B．hard
C．smart	D．serious

3. Water came into the ship，and soon，it went down to the ________of the river.

A．top	B．middle
C．surface	D．bottom

4. —Those people know how paper can be________ wood.
—They're pretty smart!

A．made in	B．made from
C．made of	D．made into

5. I want to be an astronaut in the future so that I can do ________ research in the space station.

A．funny	B．reusable
C．scientific	D．unexpected

6. Recycling is good, so don't ______ bottles or newspapers.

A．find out

B．hand in

C．use up

D．throw away

7. The box is used to collect waste which can be __, such as plastic bottles and paper.

A．reported

B．repaired

C．recycled

D．Reviewed

8. Please________ the lights to save electricity.

A．turn off	B．turn on
C．turn up	D．turn down

9. ---The house is too old and dangerous. ----Yes. We should ________soon.

A．pull down it

B．put out it

C．pull it down

D．put it out

10. In order to protect the environment，we should stop ________ in cars.

A．to ride	B．to riding
C．riding	D．ride

People usually check whether their keys, purses and phones are with them before going out, but many people in China now have one more important thing to take—a mask(口罩). They hope it can protect them ______ terrible air.
Many cities in China saw a lot of foggy days in April. In Beijing, there were eight days in April full of smog. It is dirty air ______ looks like a mixture of fog and smoke. The smoke is mainly from cars and factories in cities. Poor air is bad for people's health，______ for children and old people. They fell ill easily and the ______were full of people. They had problems with their noses and lungs.
So it's necessary ______ people from doing so many bad things to the environment. For example, people should use cars less and ______ burn lots of coal and gas. Government needs to take measures to make factories stop pouring ______waste air into the sky.
Three students from No.4 High School in Beijing ______ a report to advise how to protect the environment. They suggested ______ people should plant more trees and set off fewer fireworks for celebration.
We hope more people will join us in ______ a difference. In this way, the blue sky will certainly return for good.11.

A．in

B．from

C．for

D．at

12.

A．that

B．/

C．who

D．whom

13.

A．lucky

B．especial

C．especially

D．luckily

14.

A．schools

B．gardens

C．zoos

D．hospitals

15.

A．stop

B．stopping

C．to stop

D．stopped

16.

A．needn't

B．shouldn't

C．should

D．can

17.

A．too many

B．many too

C．too much

D．much too

18.

A．wrote

B．write

C．are writing

D．will write

19.

A．which

B．where

C．that

D．who

20.

A．make

B．to make

C．made

D．making

Your ears allow you to hear many different sounds.Some sounds can be pleasant to hear and some are not so pleasant.The louder the sound and the longer you listen to it，the more possible it is to cause damage(损害) to your hearing.
Some sounds not only harm your hearing，but also can make it hard to pay attention while reading or doing homework and prevent you from falling asleep.It is important that you learn about sound and how to identify(辨认) when it is harmful to you.
Sound is measured in units called decibels(分贝)．The greater the number of decibels，the louder the sound and the more harmful it is to your ears.The sound at 85 decibels and above may harm your hearing.

Nowadays，noise pollution is more and more serious，so you should try to protect your hearing.
◇ Turn down the TV，video game，radio，and music player.
◇ Walk away from sound that is too loud.
◇ Wear hearing protectors when needed.
21. What can we learn from the first paragraph?

A．There are two different sounds.

B．All the sounds are pleasant to hear.

C．Some sounds can damage your hearing.

D．It is good for you to listen to louder sounds for a long time.

22. Harmful sounds can ________.
①damage your hearing
②stop you from falling asleep
③keep you from having dinner
④prevent you from paying attention to doing homework

A．①②③	B．①②④
C．②③④	D．①③④

23. The sound at ________ is harmful to your hearing.

A．0

B．60

C．80

D．120

24. The sound of ________ is about 140 decibels.

A．busy city traffic	B．washing machines
C．rocket launch	D．fireworks

25. Which of the following is helpful to protect your hearing?

A．Turning up the music player.

B．Staying in a quiet place.

C．Attending a rock concert.

D．Walking on a busy street.

Hundreds of years ago，life was much harder than it is today.People didn't have modern machines then.There was no modern medicine，either.
Life today is better than it used to be，but at the same time，new problems come up.One of the biggest problems is pollution.Water pollution has made our rivers and lakes dirty.It kills fish and pollutes our drinking water.We have to talk louder because of noise pollution and it also makes us angry more easily.Air pollution is the most serious kind of pollution.It's bad for all living things in the world.
Cars，planes and factories all pollute our air every day.Sometimes the polluted air is so thick that it is like a quilt over a city.This kind of quilt is called smog.
Many countries are making rules to fight against pollution.Factories must deal with the waste water before it is thrown away.They mustn't blow heavy smoke into the air.
We need to do many other things.We can put the waste in the dustbin instead of throwing it on the ground.We can go to work by bus or with our friends in the same car.If there are fewer people driving，there will be less pollution.
26. What can make people angry more easily？(不超过5个词)
________________________
27. What is smog according to the passage？(不超过15个词)
________________________
28. What's the main idea of this passage？(不超过15个词)
_________________