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

 

 

The human body is a living machine, and, like all machines, it needs “fuel” to supply it with energy. This is provided by the food we eat. But how much do we need to stay healthy?
The energy value of food is usually measured in calories(卡). A calorie is the amount of heat required to raise the temperature of 1 kg of water by 1℃. The number of calories people need per day is different, as the picture shows. Also, the number of calories you use at any one moment normally depends on the activity you are in. For example, you need more calories for standing than for sitting, more for running than for walking, and so on.
The energy in food is in the form of three kinds of chemical materials—carbohydrate（碳水化合物）, protein（蛋白质） and fat. Carbohydrate provides 3.8 Cal /gm of the energy, protein 4.0 Cal/gm, and fat 8.8 Cal/gm. Each food contains different amounts of these materials, as the round pictures show.
(P= protein      C= carbohydrate    F=fat)
【小题1】How many calories are needed to raise the temperature of 5kg of water from 35℃ to 90℃?

A．55.

B．175.

C．325.

D．275.

【小题2】Which of the following contains the most amount of calories?

A．Milk.

B．Rice

C．Peanuts.

D．Milk or peanuts.

【小题3】Who needs the most amount of calories each day?

A．A woman.

B．An office worker.

C．A farmer.

D．A boy aged 16.

【小题4】Which of following is True?　　

A．You need more calories for swimming than for mountain climbing.

B．A child aged 8 needs the same amount of calories every day as a man over 70 does.

C．A woman feeding baby needs over 4 times the amount of calories that a baby does.

D．Everyone needs the same amount of calories per day.

【小题5】This passage mainly tells us ______.

A．all the energy is in food

B．the human body needs energy

C．the number of calories depends on your activity

D．we must only eat peanuts to get calories

The human body is a living machine, and, like all machines, it needs “fuel” to supply it with energy. This is provided by the food we eat. But how much do we need to stay healthy?

The energy value of food is usually measured in calories(卡). A calorie is the amount of heat required to raise the temperature of 1 kg of water by 1℃. The number of calories people need per day is different, as the picture shows. Also, the number of calories you use at any one moment normally depends on the activity you are in. For example, you need more calories for standing than for sitting, more for running than for walking, and so on.

The energy in food is in the form of three kinds of chemical materials—carbohydrate（碳水化合物）, protein（蛋白质） and fat. Carbohydrate provides 3.8 Cal /gm of the energy, protein 4.0 Cal/gm, and fat 8.8 Cal/gm. Each food contains different amounts of these materials, as the round pictures show.

(P= protein      C= carbohydrate    F=fat)

1.How many calories are needed to raise the temperature of 5kg of water from 35℃ to 90℃?

A．55.

B．175.

C．325.

D．275.

2.Which of the following contains the most amount of calories?

A．Milk.

B．Rice

C．Peanuts.

D．Milk or peanuts.

3.Who needs the most amount of calories each day?

A．A woman.

B．An office worker.

C．A farmer.

D．A boy aged 16.

4.Which of following is True?　　

A．You need more calories for swimming than for mountain climbing.

B．A child aged 8 needs the same amount of calories every day as a man over 70 does.

C．A woman feeding baby needs over 4 times the amount of calories that a baby does.

D．Everyone needs the same amount of calories per day.

5.This passage mainly tells us ______.

A．all the energy is in food

B．the human body needs energy

C．the number of calories depends on your activity

D．we must only eat peanuts to get calories

 

A famous teacher was speaking to the students at our school. He began his lesson by holding up a ￥100 bill. Then he said to the three hundred students， “Who would like this ￥100 bill？” The students began to put up their hands at once.
Then he said， “I am going to give this ￥100 to one of you， but first， let me do this.” He then made the bill into a ball. Then he said， “Who wants it now？” The hands went back into the air.
“Well，” he said， “What if I do this？” and he dropped it on the floor and stepped on it. He picked up the dirty， crumpled bill and said， “Who still wants it？” Hands went back into the air.
“My friends，” he said， “you have learned a valua-ble lesson today. No matter  what I did to the money， you still wanted it because it did not go down in value （价值）。 It was still worth ￥ l00！”
Many times in our lives， we are dropped， crum-pled， and stepped on by the chances we take and the things that happen to us. We feel as if we are worth nothing. But remember， no matter what has happened to you， you will never lose your value： you are always valuable to those people who love you. Your value doesn‘t come from what you do or whom you know， but WHO YOU ARE.
You are special and valuable. Don‘t ever forget it！
【小题1】Even though it was dirty， the money _______.

A．still went up in value	B．was worth nothing
C．didn‘t go down in value	D．was still ours

【小题2】We are always valuable to the people _______.

A．who pay us	B．who call us
C．who hate us	D．who love us

【小题3】The sentence “Hands went back into the air” means “_______”。

A．the students put up their hands again

B．the students put down their hands

C．the students put their hands behind their backs again

D．the students put their hands in front of them

【小题4】 Why did the famous teacher use a ￥100 bill at his lesson？

A．Because he wanted to make the bill into a ball.

B．Because he used to drop a bill on the floor and stepped on it.

C．Because he was going to give the bill to one of his students.

D．Because he wanted to make the students know what value was.