Do you know why different animals or pests (昆虫) have their special colors? Colors in them seem to be used mainly to protect themselves.

Some birds like eating locusts (蝗虫), but birds cannot easily catch them. Why? 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 the harvest time comes, locusts change to the same brown color as crops have. Some other pests with different colors 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 animal life, you’ll find the main use of coloring is to protect themselves. Bears, lions and other animals move quietly through forests. They cannot be easily seen by hunters (猎人). This is because they have the colors much like the trees.

Have you ever noticed an even stranger act? A kind of fish in the sea can send out a kind of very black liquid (液体)when it faces danger. While the liquid spreads over (散开), its enemies (敌人)cannot find it. And it immediately swims away. So it has lived up to now though it is not strong at all.

1.From the passage we learn that locusts________.

A. are small animals

B. are easily found by birds

C. change their colors to protect themselves

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

A. They run away quickly.

B. They have the colors much like their enemies.

C. They hide themselves by day and appear at night.

3. What does the underline phrase “crops” mean?

A. 灌木丛 B. 庄稼 C.水草

4.Which of the following is NOT TRUE?

A. Bears and lions can keep safe because their colors are like the trees

B. Some pests can’t change their colors with the crops.

C. The kind of fish can live up to now because its black liquid can kill its enemies.

5.Which is the best title for this passage?

A. The Change of Colors for Animals and Pests

B. The Main Use of Colors for Animals and Pests

C. Colors of Different Animals and Pests

In classroom, your teachers will talk about topics that you are studying. The information they provide will be important for you to know when you take tests. So you must be able to take good written notes from what your teachers say.

Here are the three stages(阶段) of taking notes and what you should do during each stage.

1.Before Class

Review your notes you have taken before you come to class. This will be good for remembering what was covered. Get you ready to understand new information your teacher will provide.

2.During Class

Keep your attention on what your teacher is saying and “the signal words” that tell you what your teacher is going to say and it is important to write in your notes. Examples of signal words are “The most important point…” and “Remember that…”. Be sure to include in your notes information that your teacher repeats or writes on the blackboard. Write quickly so that you can include all the important information in your notes. Do this by writing abbreviations such as med for medicine, using symbols such as % for percent, and writing short sentences.

3.After Class

Rewrite your notes to make them more complete and accurate(准确的) by changing abbreviations into whole words, symbols into words, and shortened sentences into longer sentences. Use them to answer your questions. If necessary, ask your teacher for help.

Taking notes

1.

The information is useful for your tests, so it is necessary for you to learn take good notes.

Stages

2.

Review the notes you have taken to remember what was covered.

Be ready to understand new information.

During Class

3. your teacher carefully.

Be sure to include the important points.

Write them down 4. .

After Class

Make your notes more complete and accurate to 5. your questions.

Ask for your teacher’s help.

At most school, “going green” means less rubbish or recycling. But at New York’s Riverdale Country School, it means being advised to run and even jump in the hallways. And the students really enjoy doing that.

Why? It because the hallways were built with special kinetic(动能的)tiles. When students run or jump on the floor tiles, electricity will be generated(产生). The electricity can be used to power classroom lights, science projects and charge electronic products. 14-year-old Zach Halem tried to make the officials buy them. There are eight tiles near the school’s student center.

Besides providing fun green energy, it’s also a good way to teach the students to be creative. They will be inspired to be scientists, inventors and engineers in the future to find clean energy for all humans.

The tiles are mostly made from rubber and other recycled things. They were invented by an English man Laurence Kembell-Cook. While new to the US, They have been put in many places in Europe- from a London Underground Station during the 2012 Olympics to a marathon (马拉松)track in Paris. When Pavegen started getting popular in London schools, Laurence began to realize that his invention not only saved energy ,but was also fun!

1.Why do the students of New York’s Riverdale Country School enjoy running in the hallways?

2.Who invented the special floor tiles?

3.What are the special floor tiles made of?

4.How can the kids at New York’s Riverdale Country School save energy from the floor tiles ?

5.What do you think of the invention?

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