Children have more colds because________.

A．they are usually infected about eight times each year.

B．they are not immune to many cold viruses.

C．they never wash their hands so that their thumbnails are dirty.

D．they don't like eating lemon.

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答案解析

细节题。题目问的是：儿童更易患感冒的原因是什么?用题干信息词Children，more colds定位到原文第二段倒数第三句，这里直接提出了这个问题：Why do kids seem so much more easily to get colds than their parents?紧接着后面两句讲到了原因：Simple． They haven’t had the opportunity to become immune to many cold viruses．对比分析原文和题目，本段开头就讲NJL童易患感冒，原文说的是，原因很简单，儿童不可能对多种感冒病毒都具有免疫能力(haven’t…immune to many cold viruses)，B选项中的not immune to many cold viruses和原文表达的意思一致。所以本题答案为B选项。

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1 When you are having a cold, ________.

A．it is always the same kind of cold that you had last time.

B．it may be the same kind of cold that you had last time.

C．it is certainly not the same kind of cold that you had last time.

D．it is probably not the same kind of cold that you had last time.

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2 When one is having a cold, he often has some symptoms EXCEPT________.

A．coughing.

B．having a sore throat.

C．having a runny nose.

D．having a stomachache.

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3 请根据短文内容，回答题。

Cigars Instead?

Smoking one or two cigars a day doubles the risk of cancers of the lip, tongue, mouth, and throat, according to a government study.
Daily cigars also increase the risk of lung cancer and cancer of the esophagus, and increase the risk of cancer of the larynx (voice-box) six-fold, say researchers at the National Cancer Institute in Bethesda, Maryland.
In addition, the report revealed that smoking three or four cigars a day increased the risk of oral cancer to 8.5 times the risk for nonsmokers and the risk of esophageal cancer by four times the risk of nonsmokers.
The health effects of smoking cigars is one of eight sections of the article "Cigars: Health Effects and Trends." The researchers report that, compared with a cigarette, a large cigar emits up to 90 times as much carcinogenic tobacco-specific nitrosamines.
"This article provides clear and invaluable information about the disturbing increase in cigar use and the significant public health consequences for the country," said Dr. Richard Klausner, director of the National Cancer Institute, in a statement.
"The data are clear -- the harmful substances and carcinogens in cigar smoke, like cigarettes, are associated with the increased risks of several kinds of cancers as well as heart and lung diseases," he added. "In other words, cigars are not safe alternatives to cigarettes and may be addictive."
"To those individuals who may be thinking about smoking cigars, our advice is--don't. To those currently smoking cigars, quitting is the only way to eliminate completely the cancer, heart and lung disease risks," warned Klausner.
According to National Cancer Institute press release, there haven't been any studies on the health effects on nonsmokers at cigar social events, but "... a significant body of evidence clearly demonstrates and increased lung cancer risk from secondhand smoke."
According to the report, smoking three or four cigars a day

A．increases the risk of oral cancer for non-smokers.

B．greatly increases the risk of oral cancer for smokers.

C．increases the risk of more than one cancer for non-smokers.

D．greatly increases the risk of more than one cancer for smokers.

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