Do you know why different animals or pests have their special colours? Colours in them seem to be mainly used to protect themselves.

Some birds like eating locusts（蝗虫）, but birds cannot easily catch them. Why? It is because locusts change their colurs with the changes of the colours of crops .When crops are green, locusts look green .But as the harvest time comes, locusts change into the same brown colour as crops have .Some other pests whose colours are different from plants are easily found and eaten by others .So they have to hide themselves for lives and appear only at night.

If you study the animals’ life, you’ll find the main use of colours is to protect themselves .Bears, lions and other animals move quietly through forests .They cannot be easily seen by hunters because their colours are much like the trees.

Colours are useful not only on the land , but also in the sea .A kind of fish in the sea can give out a kind of black liquid（液体）when the fish face danger. The liquid spreads over quickly, so they cannot be found by their enemies and can quickly swim away. That is why they can live safely though they are not strong at all.

1.From the passage, we can know that .

A．locusts are big animals

B．locusts are easily found by birds

C．locusts are dangerous to their enemies

D．locusts can change their colours to protect themselves

2.Those pests with different colours from plants have to to keep out of danger.

A．change their colours

B．hide in the day time and appear at night

C．move quietly

D．hide at night and appear in the day time

3.Bears and lions can keep safe because .

A．their colours are much like the trees

B．they move quickly

C．they are very strong

D．they live in forests

4.According to the passage, the fish can keep safe because .

A．they can change their colours

B．they can give out a kind of black liquid

C．they are strong enough

D．they swim faster than any other fish

5.Which is the best title for this passage?

A．The colours of the seasons

B．Animals on the land and in the sea

C．The main use of colours for animals and pests

D．How to keep safe in the sea

Can plants eat people? Probably not，but there are many plants that eat meat．Some of them are big．And they can eat small animals．One famous meat-eating plant is the Venus flytrap(捕蝇草)．

    The Venus flytrap is a very strange plant．It grows in dry parts of the United States．Its leaves are like the pages of a book．They can open and close very quickly．Inside the leaves，there are three small hairs．If a fly touches one of the hairs，the leaf closes quickly．The fly cannot get out．In about half an hour，the leaf presses the fly until it is dead．Then，the plant covers the fly．Slowly，the plant eats the fly．

    Why do plants do it? Most plants get what they need from the sun，the air，and the ground．In some places，the ground is very poor．It doesn’t have all these important things，

especially nitrogen(氮)．Animal meat has a lot of nitrogen， so some plants eat meat to get what they need．Let’s hope that some of the bigger plants don’t get the same idea !

1.The Venus flytrap is a kind of_________．

    A．plant            B．animal           C．food       D．meat

2.The Venus flytrap grows in_________．

  A．most parts of the world                  B．some parts of Africa

  C．dry parts of the United States             D．wet parts of England

3.From the passage，we learn that_________．

A．all plants can eat people                 B．all plants can eat animals

    C．some plants can eat people               D．some plants can eat animals

4.The underlined word“presses”probably means________ in Chinese．

    A．挤压            B．关上             C．打开          D．松开

5.—Why do some plants eat animal meat? —Because_________．

A．plants are dangerous to animals

    B．animals are dangerous to plants

C．plants want to get what they need from animal me

D．plants want to protect themselves against animals

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?