单选题

A、 A new treatment for people allergic to bee stings.
B、 A more effective method of preventing bee stings.
C、 The use of placebos in treating hypersensitive patients.
D、 Bee venom causing fatal reactions in hypersensitive patients.

【正确答案】 A

【答案解析】[听力原文]
A team of researchers has found that immunizing patients with bee venom instead of with the bees" crushed bodies can better prevent serious and sometimes fatal sting reactions in the more than one million Americans who are hypersensitive to bee stings. The crushed-body treatment has been ineffective. The serum made from the crushed bodies of bees produced more adverse reactions than the injections of the venom did.
The research compared results of the crushed-body treatment with results of immunotherapy that used insect venom and also with results of a placebo. After six to ten weeks of immunization, allergic reactions to stings occurred in seven of twelve patients treated with the placebo, seven of twelve treated with crushed-body extract, and one of eighteen treated with the venom.

What is the main topic of the passage?

[解析] 文章主题是关于一种对蜜蜂蜇伤过敏者新的治疗方法。

A、 It is widespread.
B、 It is extremely harmful.
C、 It is almost useless.
D、 It is sensitizing.

【正确答案】 C

【答案解析】[听力原文]
What can we learn about the traditional treatment for bee sting according to the researchers?

[解析] 从“The crushed-body treatment has been ineffective. ”可知传统方法几乎无效了。

A、 It was a serum prepared from the blood of patients who had been stung.
B、 It was a serum prepared from poison extracted from bees.
C、 It was a serum prepared from crushed bodies of bees.
D、 It was a serum prepared from a placebo and a crushed-body extract.

【正确答案】 B

【答案解析】[听力原文]
What was the most successful treatment described in the passage?

[解析] 最有效的方法是使用以蜂毒制成的免疫血清。

A、 By a series of injections given before the patient is exposed.
B、 By injection immediately after the patient has been stung.
C、 Orally for six to ten weeks before the patient is stung.
D、 Orally immediately after the patient is stung.

【正确答案】 A

【答案解析】[听力原文]
How should the treatment referred to in the passage be administered?

[解析] 文中提到injections of the venom，可以推断注射免疫血清应不止一次。

A、 Patients treated with venom were stung less frequently.
B、 Immunotherapy was effective for all patients.
C、 Immunization took place in seven out of twelve patients.
D、 The traditional treatment was as effective as the placebo.

【正确答案】 D

【答案解析】[听力原文]
What did the results of the experiment indicate?

[解析] 免疫接种6到10周后，发生过敏反应的情况是，传统方法与安慰剂疗法均为7/12，而蜂毒免疫血清疗法只有1/18。可知D正确。