When you cut your skin, you bleed(流血). If a person loses a lot of blood, he will become ill and may die. Blood is very important. People have always known that. At one time, some people even drank blood to make them strong!
When doctors understand how blood goes around inside the body, they try ways of giving blood to people who need it. They take blood from the healthy people and give it to people who need it. This is called "blood transfusion"(输血). The blood goes from the arm of the healthy person into the arm of the sick person.
But there are two problems. First, it does not always work. Sometimes people die when they have blood transfusion. Later, doctors find that we do not all have the same kind of blood. There are four groups-O, A, B and AB. We all have blood of one of these groups. They also find that they can give any kind of blood to people of group AB. But they find that they must give A-group blood to A-group people and B-group blood to B-group people. I have O-group blood and the doctor told me that I could give blood to anyone else safely.
There is another problem. To give blood of the right kind, doctors have to find a person of the right blood group. Often they can not find a person in time. If they have a way to keep the blood until someone needs it, they can always have the right kind of blood. At first they find they can keep it in bottles for fifteen to twenty days. They do this by making it very cold. Then they find how to keep it longer. In the end they find a way of keeping blood for a very long time.
We call a place where we keep money a "bank". We call a place where we keep blood a "blood bank". One day, when you grow up, you may decide to give blood to a "blood bank". In this way you may stop someone from dying. Or perhaps one day you may become ill. You may need blood. The "blood bank" will give it to you. 370words
35. From the passage, we learn that sometimes people die when they have blood transfusions
because they_______.
A. are unhealthy people B. are AB-group people
C. have lost a lot of blood D. are not given the right kind of blood
36. Which of the following is true?
A. The writer has never had a blood transfusion.
B. The writer can give blood to B-group people.
C. Doctors can give any kind of blood to the writer.
D. The writer has the same kind of blood as his father.
37. From the last paragraph of the passage, we learn that_______.
A. the writer thinks it's good to give blood to a "blood bank"
B. we may become ill if we give blood to a "blood bank"
C. many people died because they lost a lot of blood
D. blood is more important than money
D
Do you know anything interesting about colours? Did you know that colours can affect (影响) our moods? Colours can change our moods and make us feel happy or sad, energetic or sleepy. This report explains what colours can do and what characteristics (特征) they represent.
Calm colours
Have you ever walked into a room and felt relaxed? It could be because the walls were painted blue, a calm and peaceful colour.
Some colours make us feel calm and peaceful. Blue is one of these colours. Wearing blue clothes or sleeping in a blue room is good for our mind and body because this colour creates a feeling of harmony. Blue can also represent sadness, so you may say "I'm feeling blue" when you are feeling sad. White is another calm colour. It makes you feel calm and peaceful. You should wear white if you are feeling stressed.White is also the colour of purity. Many women like to be in white on their wedding day.
Warm colours
Some colours can make you feel warm. These colours can give you a happy and satisfied feeling. People living in cold climates prefer to use warm colours in their homes to create a warm and comfortable feeling there. They would rather use colours like orange or yellow than white or blue.
Orange represents joy. It can bring you success and cheer you up when you are feeling sad. Yellow is the colour of the sun, so it can remind you of a warm, sunny day. Yellow is also the colour of wisdom. Some people prefer this colour when they study for exams. For example, they may use yellow stationery.
Energetic colour
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