【正确答案】 C

【答案解析】[听力原文]
Every day at least eight Americans choke to death when food or other objects become lodged in their throats. Their deaths occur because choking is often confused with heart attack, or because old remedies, such as hitting a person on the back, are not successful.
However, the Heimlich maneuver, developed in 1947, is an easily-applied technique to help save the choking victim. It must be applied quickly, for the choking victim has but four or five minutes to live after an object is stuck in his throat. The technique involves several procedures, depending on whether the victim is standing, sitting, or lying down, but the basic maneuver is the following: Make a fist with your hand, place it on the abdomen above the belly button and below the ribcage, and press in and upward with a quick thrust. The procedure may be repeated several times if necessary until enough force is applied to eject the object. If you are alone and choking, you should use your own fist, or press into a table or a sink.
Occasionally, the Heimlich maneuver results in a cracked rib, a small price to pay for a life.

What is the talk mainly about?

[解析] 主旨题。录音首先表明了被食物噎住的危险性。其后详细介绍了如何使用海姆利克氏操作法来挽救被噎住的人。

【正确答案】 A

【答案解析】[听力原文]
On what does the success of the Heimlich maneuver primarily depend?

[解析] 推断题。根据录音，当使用海姆利克氏操作法时一定要快且及时，因为被噎住的人一般只有四至五分钟存活的时间。

【正确答案】 B

【答案解析】[听力原文]
What kind of people does the technique aid?

[解析] 细节题。录音中提到，海姆利克氏操作法是一种挽救那些被噎住的人的简单的方法。

【正确答案】 C

【答案解析】[听力原文]
What is the basic maneuver of the Heimlich technique?

[解析] 细节题。录音中提到，海姆利克氏操作法包括一些步骤，取决于不同的情况，但最基本的是将拳头放在肚脐和胸腔之间，并快速向上推挤。

【正确答案】 B

【答案解析】[听力原文]
Which of the following statements is true?

[解析] 细节题。录音最后介绍了自救的方法，由此可知，被噎住的人可以自救。录音中提到，当使用海姆利克氏操作法时一定要快且及时，因为被噎住的人一般只有四至五分钟存活的时间。因此A项不正确。根据录音可知，海姆利克氏操作法于1947年被发明。因此C项不正确。另外，根据录音可知，被噎住导致的窒息总被和心脏病弄混。故D项不正确。