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Do you know why different animals or pests have their special colors? 1 .
Some birds like eating locusts，but birds cannot easily catch them．Why? 2 When crops are green，locusts look green．But as the harvest time comes，locusts change to the same brown color as crops have． 3 So they are 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． 4
Have you ever noticed an even stranger act? A kind of fish in the sea can send out a kind of very black liquid when it faces danger．While the liquid spreads over，its enemies cannot find it． 5 So it has lived up to now though it is not strong at all．
| A．This is because they have the colors much like the trees． B．Colors in them seem to be used mainly to protect themselves． C．And it immediately swims away． D．Different animals like different colors． E．It is because locusts change their colors together with the change of the colors of crops F．Some other pests with different colors from plants are easily found and eaten by others |
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Is human blood all the same? “Yes，” you may say．“It's all red．”
Well，it's not as simple as you might think．
Blood is made up of different parts，such as red blood cells，white blood cells，and platelets（血小板）．
Two chemical molecules（分子）on the red blood cells make people's blood different．Scientists mark one molecule "A" and the other molecule "B".
According to which and how many molecules are on the red cell, scientists divide blood into four types: A, B, AB and O.
Your blood type will stay the same your whole life.
Scientists have been wondering if there are some links between people's blood type and their personalities but they don't know for sure yet.
But some say that people with the same blood type may have things in common.
What's your blood type? Do you have family members or friends who are the same type as you? Read the following. Are you like this?
People with type A: They look peaceful from the outside. But they ask too much of themselves that they may be very nervous inside. They get happy or sad easily. Sometimes they are shy but always very careful. They can easily win people's trust.
People with type B: They have strong minds. Once they start a task, they don't give up easily. They'll try their best to finish it and do it well. Type B people always try to make themselves different from others. They want to do things in their own way in life.
People with type AB: They are maybe the strangest among all blood types. They can be both open and shy, noisy and quiet at the same time! They are responsible （负责的） and always ready to help others.
People with type O: They're open and good at making friends. They always start tasks but don't always finish them. They have lots of new ideas and love to be the centre of attention. They always strongly believe in themselves.
1. What's the main subject of this passage?
A．blood types B．blood types and personalities
C．personalities D．scientific research on blood
2. The blood types are decided by ____________.
A．the amount of white blood cells
B．the amount of platelets
C．the kind and amount of molecules on the red cell
D．the kind and amount of molecules on the white cell
3. Scientists are ________ about the relation between blood types and personalities.
A．not sure B．quite sure C．excited D．worried
4. If a person always tries to be different from others, he/she might have _________ blood.
A．A type B．B type C．AB type D．O type
5. Which of the following is NOT true according to the passage?
A．A person's blood type will never change throughout his life.
B．A person's blood type might have something to do with his/her personality.
C．A person with type O blood is usually confident.
D．A person with type A blood has the strangest personality.
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