题目内容
Laughter, along with an active sense of humor, ______ protect you against a heart attack, according to a recent study.
A. have helped B. helped C. help D. helps
D
【解析】
试题分析：本句的主语是laughter，和后面的an active sense of humor没关系，故谓语动词使用单数形式。句义：根据最近的一项调查，笑声和幽默感可以帮助保护我们不受心脏病的攻击。本句中没有出现过去时的时间状语，而且是对经常性的事情的说明，故D正确。
考点：考察时态和主谓一致
There is an English saying : “ ___【小题1】____”. Until recently, few people took the saying seriously. Now, however, doctors have begun to look into laughter and the effects it has on the human body.____【小题2】___.
Tests were carried out to study the effects of laughter on the body. People watched funny films while doctors checked their hearts, blood pressure, breathing and muscles. It was found that laughter has similar effects to physical exercise. ___【小题3】____ . If laughter exercises the body, it must be beneficial.
Other tests have shown that laughter appears to be able to reduce the effect of pain in groups of students who listened to different radio programs. The group that tolerated (忍耐) the pain for the longest time was the group which listened to a funny program. __【小题4】___ .
____【小题5】____ . They have found that even if their patients do not really feel like laughing, making them smile is enough to produce beneficial effects similar to those caused by laughter.
| A．Laughter can prolong one’s life. |
| B．As a result of these discoveries, some doctors in the United State now hold laughter clinics in which they help to improve their patients’ condition by encouraging them to laugh |
| C．The reason why laughter can reduce pain seems to be that it helps to produce a kind of chemicals in the brain which diminish both stress and pain |
| D．It increases blood pressure, the heart beating and breathing; it also works several groups of muscles in the face, the stomach and even the feet. |
F. laughter is the best medicine
G. They have found that laughter really can improve people’s health
