Question

In the rush to get to school, you drop a piece of toast on the floor. Do you throw it away or dec ide it’ s still OK to eat? If you’re like most people, you eat it. Maybe you follow the “5-second rule”, which claims foods are safe to eat if you pick them up within 5 seconds after dropping them. But you might want to think again. Scientists now say that 5 seconds is all it takes for foods to become polluted with enough bacteria（細(xì)菌） to make you sick.

     Bacteria can cause many kinds of illnesses. Some kinds of bacteria can grow on food. If you eat foods on which these bacteria are growing, you can become sick.

 One of these food-borne bacteria is Salmonella. It makes 1.4 million people sick every year. Salmonella is often found in raw eggs and chicken. Cooking kills these bacteria, which is why it is so important to cook eggs, chicken, and other foods thoroughly.

 But how long does it take these bacteria to pollute food? A team of scientists in South Carolina did an experiment. First, they placed an amount of Salmonella on three surfaces; wood, tile (瓦片), and carpet. They placed a piece of bread and a piece of bologna（大臘腸） on each surface for 5,30, or 60 seconds. After just 5 seconds, both the bread and the bologna picked up enough bacteria to make you sick.

 So forget the 5-second rule. If your toast drops on the floor, throw it away and get another piece of clean toast. This time, be careful not to drop it!

1. In which part of a newspaper can you most probably find this passage?

A. Culture B. Health C. Advertisement D. Technology

2.After dropping a piece of toast , a person who follows the “5-second rule”will

A. throw away dirty toast immediately and go away

B. pick up the toast as quickly as possible and eat it

C. eat the toast within 5 seconds and feel pleased

D. get another piece of clean toast quickly and eat it

3. The scientists in South Carolina did the experiment to

A.see how quickly bacteria can pollute food

B. show that the 5-second rule a correct

C. see how harmful bacteria are to people’ health

D. show that bacteria grow at different speeds on different foods

4. What’s the writer’s attitude to the “5-second rule”?

A. Positive B. Negative C. Neutral (中立) D. Cautious (謹(jǐn)慎)

 

Answer 1

【答案】

 

1.B

2.B

3.A

4.B

【解析】

試題分析：人們遵循的“五秒鐘法則”即：“掉落的東西在5秒鐘之內(nèi)是不會(huì)沾染細(xì)菌的”.這一說(shuō)法是正確的嗎？美國(guó)南卡羅萊納州的科學(xué)家做了一個(gè)實(shí)驗(yàn)，結(jié)果發(fā)現(xiàn)僅僅五秒鐘,沾染到食物上的細(xì)菌足以致病，所以下次掉地上食物的時(shí)候，還是忘掉五秒鐘法則吧。

1.B推理判斷題。在文中作者講述的是掉地上的食物是否食用安全這一問題，內(nèi)容與健康有關(guān)，由此推斷B選項(xiàng)正確。

2.B細(xì)節(jié)理解題。根據(jù)文章第一段If you’re like most people, you eat it. Maybe you follow the “5-second rule”,。。。after dropping them.可知遵循“五秒鐘法則”的人會(huì)把掉地上的食物盡可能快地拾起吃掉，故選B。3.A細(xì)節(jié)理解題。從文章第三段But how long does it take these bacteria to pollute food? A team of scientists in South Carolina did an experiment.可知科學(xué)家實(shí)驗(yàn)的目的就是為了證明食物在多長(zhǎng)時(shí)間內(nèi)才會(huì)沾染到足以致病的細(xì)菌，所以A選項(xiàng)正確。

4.B推理判斷題。根據(jù)文章最后一段So forget the 5-second rule. If your toast drops on the floor, throw it away可知作者不贊同“五秒鐘法則”，故選B。

考點(diǎn)：考查科學(xué)知識(shí)類短文閱讀。