4.In “good weather” of 18 centigrade, _______.

　A. people are very forgetful B. people can’t do their work well

　C. thin people feel cold D. people are in better health

3.Low air pressure may make people _______.

　A. forgetful B. sad C. angry D. tired

2.People may have more intelligence when _____ comes.

　A. a rain B. very hot weather

　C. a strong wind D. low air pressure

1.____ can have a bad effect (作用) on health.

　A. Hot and wet weather B. Good weather

　C. Warm weather D. High intelligence

5. The passage mainly (主要) tells us _______.

　A. how to find the blind spot B. an interesting experiment

　C. where the blind spot is D. there is blind spot on the eye

　Passage 25

　Different weather makes people feel different. It influences (影响) health, intelligence (智力) and feelings.

　In August, it is very hot and wet in the southern part of the United States. People there have heart trouble and other kinds of health problems during this month. In the Northeast and the Middle West, it is very hot at some times and every cold at other times. People in these states have more heart trouble after the weather changes in February or March.

　The weather can also influence intelligence. For example, in a 1983 report by scientists, IQ (智商) of a group students were very high when a very strong wind came, but after the strong wind, their IQ was 10% below. The wind can help people have more intelligence. Very hot weather, on the other hand (另一方面), can make it lower. Students in many schools of the United States often get worse on exams in the hot months of the year (July and August).

　Weather also has a strong influence on people’s feelings. Winter may be a bad time for thin people. They usually feel cold during these months. They might feel unhappy during cold weather. But fat people may have a hard time in hot summer. At about 18C, people become stronger.

　Low air pressure (气压) may make people forgetful. People leave more bags on buses and in shops on low-pressure days. There are a “good weather” for word and health. People feel best at a temperature of about 18 centigrade (摄氏度).

　Are you feeling sad, tired, forgetful, or unhappy today? It may be the weather’s problem.

4. In which order (顺序) should you do the experiment?

　①Hold the card ②Move the card nearer ③Close your right eye

　④Write two English letters ⑤Look at the letter R ⑥Make a card

　A. ④⑥①②③⑤ B. ①③⑥④⑤② C. ⑥①④③②⑤ D. ⑥④①③⑤②

3. You fail to see the letter L in the experiment because ___________.

　A. your eyes are poor B. its image falls on the blind spot

　D. your left eye is not open C. you move it close to your eye

2. The word “disappear” in the passage means ________ in Chinese.

　A. 驱散 B. 消散 C. 消失 D. 遗失

1.The writer of the passage thinks that _____ there is a blind spot on the eye.

　A. few people know B. no one knows C. most people know D. all the people know

4.From the experiment we can conclude that about _____ of people who suffered from heart attacks without aspirin died.

　A. 7% B. 11% C. 19% D. 44%

　Passage 24

　It seems to be strange to you there is a blind spot (盲点)on the eyes. Here is an interesting experiment (实验) that can make something disappear, when one eye is open.

　Make a card about the size of a postcard and write two English letters L and R on it, L on the left and R on the right. First, hold the card about 80 cm away and you see both the letters. Then close your right eye and look at the letter R only with your left eye. And now, as you move the card slowly towards you, you’ll find the letter L disappearing. But if you move the card nearer to your face, the letter will be seen again. Now do the same experiment with your left eye closed, you’ll find the letter R disappearing.

　Why does the letter disappear? It is because there is a blind spot on the eye. When the image (影像) of the letter falls on the blind spot, it won’t be seen. That is why either of the letters disappears.