April 22 is Earth Day. Everyone on Earth should care about and protect the earth!

The earth has warmed by about 1°F (华氏度) over the past 100 years, but why and how?

Well, scientists are not quite sure. Maybe the earth gets warmer and warmer on its own. But many scientists say that people are doing many things which makes the earth warmer.

First, greenhouse effect (温室效应) is a very important reason for the change of the earth. People give out too much energy into the air every year. It makes the earth warmer. Climate (气候) change is another important reason. Sometimes it becomes too hot and sometimes too cold. Sometimes there is too much rain and sometimes too little. The change of the climate makes the earth warmer. In turn, the warmth of the earth changes the climate, too.

When the earth becomes warmer, there may be more rain and a rise in sea level. It will affect the growth of plants, animals and people. On a Pacific island, 100 people have to move to higher ground because the sea is rising. These people can no longer live on the coast. Before that, two islands without people went underwater in 1999. Scientists say that the seas can rise by nearly one metre by 2100.

People can affect the earth's air, land and water. As for us, we can do many things to protect the earth. For example, we can use fridges less. We can tell more people about protecting the earth.

1.Earth Day is probably set for people to ______.

A．learn more about the earth                B．make full use of the earth

C．take better care of the earth.              D．study the warmth of the earth

2.We can infer (推断) from the passage that the reasons for the warmer earth are

______ now.

A．not very clear      B．completely secret   C．well known        D．not given yet

3.Greenhouse effect comes from______.

A．sea rising          B．climate change     C．nature's unbalance  D．people's activity

4.The passage mainly tells us that ______.

A．there is more rain now                   B．we should protect the earth

C．we must stop pollution                   D．sea level is getting higher

My name is Chen Lan. My home is in Gulangyu. Do you know it? It is in Xiamen. It is near the sea(海). Gulangyu is a small place，but it is very nice and clean. There are no cars，no buses. People only walk. So it is very quiet.
Our house is in the middle of Gulangyu. Behind our house there is a big old tree. My grandfather tells me that the tree is very，very old. There are many birds in the tree. We call it a “bird tree”. Our house is near the sea. The sea is big and blue. There are a lot of fish in the sea. After school，I go there and catch(捉) fish with my friends. It is very interesting. I like fish and I like catching fish.
【小题1】Chen Lan is from _______.

用方框内所给词语的适当形式填空，使文章通顺、完整。（每词限用一次）

Sydney is a young city. Its history goes back just over 200 years. But in Australia, it is the oldest city. It is also the country' s largest city. Sydney is the capital of New South Wales and the most popular city of Australia.

The climate of Sydney is very good. It' s not too cold during the winter and not too hot during the summer. The sky is blue, the air is fresh, and birds sing in the garden. People who live in Sydney seem to have an easy life style. They will tell you, "Don't worry. "

Many people think that Sydney is one of the most attractive cities in the world. It has many tall and modern buildings. Among them, Center point Tower is the tallest. Standing on the 305-metre(80 storeys)tower, you will have a great view of the city.

Sydney is famous for its deep harbor(港口). The harbor has many bays(湾) and beautiful surf beaches.? Among them, Bondi beach is the most popular.? Sydney Harbor is not only beautiful, it also serves as a large port. Ships carry wool, wheat and meat from Sydney to other countries.

People living in Sydney like to call themselves Sydneysiders. They are mostly friendly and easygoing. When they are not working, they love to have a good time at the beach, swimming and sailing.

1.Sydney is the???????? city in Australia.

A. youngest??????? B. largest????? C. coldest?????? D. hottest

2. It seems that people in Sydney have easy life because????????? .

A. the climate is very good

B. the sea is very beautiful

C. they are very rich

D. they always tell you, "Don't worry. "

3.What is true about the Center point?

A. It' s the tallest building in the world.

B. It's an old building.

C. You can see most of the city on it.

D. It' s 80-metre tall.

4. Australia is rich in???????? .

A. wool????????? B. wheat???????? C. meat????? D. all the above

5.What do you think of people in Sydney?

A. cool????????? B. busy?????????? C. shy?????? D. warm-hearted

It is December 25th, 2050. The people in the city are all celebrating Christmas. I’m the mayor of our city. My citizens* and I are holding a big party under the sea, though you wouldn’t believe it. But please do not feel excited, you should feel sad because we have to live under the sea. Because of the pollution, the earth has been completely destroyed, from top to bottom. The atmosphere* has no oxygen* and moisture*. As a result, the plants are burned by the strong sunlight with a great number of harmful rays. Of course, none of them are still alive. Not only no green, but also the temperature reaches about 121℃ all day even in winter because there is too much CO2 circling the earth.
On the land, there is no life. Luckily, the sea is not destroyed by human. So, we have to move into the sea. At the bottom of the water, people have built many new cities. There is a lot of advanced* equipment* in each city. Computers are used to control all the machines, even the people’s life. We can also make the seawater into fresh water. There are two machines making oxygen. If they stop working for only one minute, more than 10 million people will die.
The population of our city is over 30 million and, of course, it is quite crowded. We have lots of high buildings and bridges. The roads are wide, too. Our cars are miniature* UFOs, don’t be surprised, it is true. At the bottom of the sea you can’t see anything, because there is no light all day. However, we have advanced lighting equipment so that we can see the “sun” under the sea. Of course, the advanced lighting equipment is very expensive. And if it doesn’t work, we can see nothing under the sea. What should we do then?
【小题1】Where are they holding a big Christmas party?