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High in the mountains, and deep in the forest, lives a lake with many plants and animals in and around her. The plants and animals have enough food and clean water to keep them healthy. The wind carries pure air, and the rain comes down clear and clean.

But recently, Lucy Lake and her friends haven’t been feeling very well. All the plants and animals get together to talk about the problem. “Why are we sick?” “What can we do?” ask all of them. No one has any answers.

Just then two hikers appear. The animals tell them about their problems. “Can you help us?” they ask. “Yes,” one hiker says. “I think it’s because of acid rain.”

“Acid rain comes from chemicals(化學物質) in the air. The pollution comes from factories, cars and trucks.”

“So, although I don’t want to, I help the pollution travel through the air!” says the wind. “And I carry it to the land!” cries the rain. 

“If you can help us think of some solutions(解決方法), we will send a message to tell people how to clean up our environment,” one hiker says. 

With the help of the plants and animals, the two hikers make a list of ideas for saving Lucy Lake and her friends.

Time passes, and the forest and lake begin to feel a little better.

The next time the hikers climb up the mountains to Lucy Lake, they smile at what they find. “We’re glad things have started to change,” one hiker says. “And we’re glad you helped us make a difference,” says the other.

1.The underlined word “pure” can be replaced by “____”.

2.The two hikers are most probably ____.

3.____ have (has) nothing to do with the cause of acid rain.

4.The underlined word “you” refers to (指) ____. 

5.Which of the following is NOT true?

When you visit Taiwan，Green Island is a wonderful place not to be missed.

Green Island，with clear blue water around it，is an island in the Pacific Ocean,33 kilometers east of Taitung. The old name for Green Island was Huoshandao，meaning “fireburning island”. The island got its name because people on the island used to set up fires at night to help people who went fishing home. Another story goes that in the Qing Dynasty there was a fire and most of the island’s trees and grass died. The coastline(海岸) of the island is only 20 kilometers long，the tallest mountain is only 281 meters high and the island is only 15 km²，but it is attracting(吸引) a growing number of tourists.

Green Island has a lot of interests that make it a place where people like to go：seaside，a clean white beach，green grasslands，seawater，hot springs，beautiful undersea sights，and a great many plants and animals. Another thing of Green Island that people are interested in is its rocks in different shapes. “Sleeping Beauty” and “Pekinese Dog” are the two most strangely shaped ones. There are also other interests which one cannot miss. The green hills，blue sea，clear sky，and ocean gentle winds make a “must” for you.

1.From the article we know Green Island is ________.

A. very large                            B. 281 meters long

C. in the Indian Ocean                   D. 33 kilometers from Taitung

2.According to the two stories，people on Green Island used to ________.

A. meet a lot of visitors                B. set fires to get warm

C. make a living by fishing              D. cut down too many trees and grass

3. The sight “Pekinese Dog” is ________ on Green Island.

A. a cute living dog                     B. a rock like a dog

C. a dog­shaped plant                    D. a dog of “Sleeping Beauty”

4.The last passage is mainly about the ________ of Green Island.

A. sights         B. history       C. people        D. culture

The Earth has warmed by about half a degree（0.50℃）over the last 100 years. It could be getting warmer on its own, but many scientists think that people are making the Earth warmer by making a greenhouse effect. The greenhouse effect is important.  Without it, the Earth would not be warm enough for us to live on. But just a little warmer than it is now could cause problems for humans, plants and animals.

Many of the things we do every day can change the Earth’s temperature by sending greenhouse gases into the air. We send greenhouse gases into the air when we watch TV, turn on lights, dry hair, play video games, wash or dry our clothes or drive cars. The rubbish from factories and homes also produces greenhouse gases.

     Even a small change in temperature can affect our weather. This can cause changes in the sea levels, the air, flooding, and our fresh water.

The change in the temperature can also cause changes in the living places for animals and plants, endangering many animals.

     Global warming is a big problem, and every little bit we do can help. We can save electricity. We can save energy in other ways such as by taking buses or walking rather than driving cars. We can recycle to reduce the rubbish and save natural resources such as trees, oil and metals. We can buy products that don’t do bad to the environment and we can turn to solar energy. Remember the little bit that you do will bring a better world.

1. Which of the following does not send greenhouse gases into the air?

A. Watching TV.                     B. Turning on a light.

C. Driving a car.                     D. Walking to school.

2. In this passage, the scientists are mainly trying to make the readers realize___________ .

A. the greenhouse effect is important

B. humans are making the earth warmer

C. the earth is getting warmer in 100 years

D. the earth could be getting warmer by itself   

3. Without the greenhouse effect，we would _____________ .

A. be safer                         B. not be able to live

C. have a cleaner earth                D. have a better world

4. The writer gives us advice on how to save energy in __________ .

A. Paragraph 2                      B. Paragraph 3     

C. Paragraph 4                      D. Paragraph 5

5. Global warming is a big problem but ___________ .

A. we can't do anything to help        B. we don't need to do anything

C. we can do something to help       D. we can do something to stop it