Do you know why different animals or insects have their special colors? Colors are used mainly to protect themselves.

Why can’t some birds easily catch locusts（蝗虫）? It is because locusts change their colors together with the change of the colors of crops. When crops are green, locusts look green. But as autumn comes, locusts change to the same brown color as crops have. Some other insects with different colors from plants are easily found and eaten by others. So they have to hide themselves for lives in the day and appear only at night.

If you study the animal life, you’ll find the main use of coloring is to protect themselves. Bears, lions and other animals can’t be easily seen by hunters. This is because they have the colors much like the trees.

Have you ever noticed an even more strange thing? A kind of fish in the sea can send out black liquid when it faces danger. While the liquid spreads over, its enemies can’t find it. And it quickly swims away. So it has lived up to now though it is not strong at all.

1. From the article we learn that locusts 　　　　　　　　　.

A. are dangerous to their enemies           B. are easily found by birds

C. change their colors to protect themselves   D. are small animals

2.How can insects with different colors from plants keep out of danger?

A. They have to move quietly.

B. They hide themselves in the day and appear at night.

C. They have the colors much like their enemies.

D. They run away quickly.

3. Bears and lions can keep safe because 　　　　　　　　　.

A. they live in forests                  B. they like brown and grey colors

C. they move quietly　                   D. they have the colors similar to the trees

4.What does the word “liquid” mean in the last paragraph?

A. 气体          B. 固体　       C. 液体　       D. 水蒸气

5. Which is the best title for this passage?

A. The Main Use of Colors for Animals and Insects

B. Colors of Different Animals and Insects

C. The Change of Colors for Animals and Insects

D. The Change of Different Animals and Plants

 

 

 

Lake Victoria is the largest lake in Africa. It is also the second largest lake in the world. It is an important lake because it is one of the sources(源头) for the longest river in the world, the Nile River. Lake Victoria provides a source of water, food, and power(电力) for several African countries. Lake Victoria is a big part of African life.

Unfortunately, Lake Victoria has a problem. It is shrinking. There are several power stations at Lake Victoria in Uganda. These are on the Nile River, and besides producing power, they keep the water of the lake at a certain level. For the past forty years, that level has been 11.9 meters. Over the last several years, the water level has dropped by about 2.5 meters. There seem to be several reasons for this drop.

One possible reason is drought(干旱). Drought has been very bad in the area since 2000. Lake Victoria gets all of its water from rain, so the drought means less water in the lake.

However, some environmentalists believe that the real problem is the power plants(工厂) on Lake Victoria. Uganda depends on those power plants for most of its power, and they made the power plants larger in 2000. Many people believe the power plants have been taking too much water off Lake Victoria. As a result, they have been asked to use less water until Lake Victoria goes back to its old level.

Whether the low water level is caused by drought or power plants, the result is the same. This is already a poor area of Africa, where many people live a really hard life. People, animals and plants around Lake Victoria will suffer even more from low water levels on the lake. Many people need Lake Victoria for fishing or growing food. Fish need the water to live, and animals need it for water. Plants around the lake will die without the water, and then more animals and people will suffer. Unless the lake fills soon, many people will suffer and die.

1.Lake Victoria is __________.

A. an important lake in Africa

B. the largest lake in the world

C. the source of water, food and power for America

D. the only source for the Nile River

2.What does “It is shrinking” most probably mean?

A. It is becoming larger.

B. It is becoming more beautiful.

C. It is becoming smaller.

D. It is becoming more useful.

3.The water level of Lake Victoria is now __________.

A. 2.5 meters     　B. 11.9 meters              C. 14.4 meters          D. 9.4 meters

4.Which of the following is NOT true according to the passage?

A. Rain water is the only source for the lake.

B. There has been little rain in the lake area since 2000.

C. The power plants in Uganda provide water for the lake.

D The power plants in Uganda were made larger in 2000.

5.According to the passage, how can we solve the problems around Lake Victoria?

A. People must build more power plants.

B. More sources of water must be found.

C. Every country should offer some money to Africa.

D. All the people living in the area should move to another place.

 

选词填空

other, move, enough, find ,desert, make, use another, friend , carry , trouble, friendly

You may think there is nothing but sand in the desert of the world, but it is not true. In the desert we can   76   stones. We can see hills, too. There is a little rain in the   77  , but it is not   78  for most plants.
　　The animals are   79  to the desert people in many ways. The desert people eat the meat and drink the milk of the animals. They use their skins to    80  shoes, water bags and even tents(帐篷). They use the camels(骆驼) for   81  things.
The people of the desert have to keep    82  from places to place. They must always look for grass or desert plants for their animals. They usually live in the tents. When there is mo more food for their animals, they take down their tents, put them on the camels and move to    83  place. The desert people are very   84 . No man in the desert would ever refuse to help the people in   85  and give them food and water

选词填空

other, move, enough, find ,desert, make, use , another, friend , carry , trouble, friendly

You may think there is nothing but sand in the desert of the world, but it is not true. In the desert we can   76   stones. We can see hills, too. There is a little rain in the   77   , but it is not   78  for most plants.

　　The animals are   79  to the desert people in many ways. The desert people eat the meat and drink the milk of the animals. They use their skins to    80  shoes, water bags and even tents(帐篷). They use the camels(骆驼) for   81  things.

The people of the desert have to keep    82  from places to place. They must always look for grass or desert plants for their animals. They usually live in the tents. When there is mo more food for their animals, they take down their tents, put them on the camels and move to    83  place. The desert people are very   84 . No man in the desert would ever refuse to help the people in   85  and give them food and water

 

选词填空

other, move, enough, find ,desert, make, use another, friend , carry , trouble, friendly

You may think there is nothing but sand in the desert of the world, but it is not true. In the desert we can   76   stones. We can see hills, too. There is a little rain in the   77   , but it is not   78  for most plants.

　　The animals are   79  to the desert people in many ways. The desert people eat the meat and drink the milk of the animals. They use their skins to    80  shoes, water bags and even tents(帐篷). They use the camels(骆驼) for   81  things.

The people of the desert have to keep    82  from places to place. They must always look for grass or desert plants for their animals. They usually live in the tents. When there is mo more food for their animals, they take down their tents, put them on the camels and move to    83  place. The desert people are very   84 . No man in the desert would ever refuse to help the people in   85  and give them food and water