Pa age 23 　　Researchers (研究者) have a ounced (宣布) the result of two studies on the health effects of the drug a irin (阿斯匹林). One study shows a irin can sharply reduce the chance that a healthy, older man will suffer from a heart attack (心脏病). 　　The study offered two new results from earlier findings. It said taking one a irin pill every other day helped only healthy men over the age of fifty. It also said a irin gave the greatest protection agai t heart attacks to men with low blood cholesterol (胆固醇) levels. 　　Earlier in the United States began a major a irin study in the early 1980s. It included 22,000 healthy men doctors. All were between the ages of forty and eighty-four. More than 11,000 of the doctors took a harmle pill that contained no drug. The men did not know which kind of pill they were taking. 　　The doctors who took a irin suffered 44% fewer heart attacks than those taking the harmle pill. 139 men who took a irin suffered from heart attacks. Ten of them died. 239 men who did not take a irin suffered from heart attacks. Twenty-six of them died. 　　The researchers said the doctors’ study provides clear proof that taking a irin can prevent a first heart attack in healthy, older men. They said, however, the result does not mean every man over the age of fifty should take a irin. They said a irin couldn’t help men who do not eat healthy foods, who smoke cigarettes and who are fat. The researchers said men who think they would be helped by taking a irin should talk with their doctors first. 　　1.The pa age tells us that the new use of a irin is ______. 　　A.to treat heart disease 　　B. to reduce pain while one suffers from a heart attack 　　C. to help old people to be more healthy 　D. to reduce the chance of a heart attack in old men 　　2.A irin can help those who ______. 　　A work as doctors . are under 40 years old 　　C. are fat and smoke cigarettes D. are older and healthy 　　3.At last the researchers advised us to take a irin ______. 　　A.with care B. as much as we like 　　C. every day D. only co idering the age 　　4.From the experiment we can conclude that about _____ of people who suffered from heart attacks without a irin died. 　　A. 7% B. 11% C. 19% D. 44% 　　Pa age 24 　　It seems to be strange to you there is a blind ot (盲点)on the eyes. Here is an interesting experiment (实验) that can make something disa ear, 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 disa earing. 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 disa earing. 　　Why does the letter disa ear? It is because there is a blind ot on the eye. When the image (影像) of the letter falls on the blind ot, it won’t be seen. That is why either of the letters disa ears. 　　1.The writer of the pa age thinks that _____ there is a blind ot on the eye. 　　A. few people know B. no one knows C. most people know D. all the people know 　　2. The word “disa ear” in the pa age mea ________ in Chinese. 　　A. 驱散 B. 消散 C. 消失 D. 遗失 　　3. You fail to see the letter L in the experiment because ___________. 　　A. your eyes are poor B. its image falls on the blind ot 　　D. your left eye is not open C. you move it close to your eye 　　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 　　5. The pa age mainly (主要) tells us _______. 　　A. how to find the blind ot . an interesting experiment 　　C. where the blind ot is D. there is blind ot on the eye