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Health advice on hand sanitizers Antibac...

Health advice on hand sanitizers

Antibacterial hand sanitizers(免洗洗手液)are marketed as a good alternative(替代品)when soap and water are not available. Manufacturers say that their sanitizers kill 99.9 percent of germs(细菌), but research suggests that this not the case.

How do hand sanitizers work?

Most sanitizers are alcohol-based; they work by removing the outer layer of oil on our skin, then the alcohol kills the bacteria.

However, Barbara Almanza, associate professor at Purdue University, notes that hand sanitizers do not significantly reduce the amount of bacteria, and in some cases, can increase it.

So the question arises, how can manufacturers say sanitizers kill 99.9 percent of bacteria?

How can manufacturers make the 99.9 percent claim(声称)?

Manufacturers test their products on bacteria-tainted surfaces. In this controlled environment, hand sanitizers do kill 99.9 percent of bacteria. However, the human hand is a lot more complex and goes through a lot of different changes in a day compared to a controlled surface.

These tests allow manufactures to obtain consistent results. But , in reality, how effective are hand sanitizers in killing bacteria in everyday life?

Hand sanitizer VS hand soap and water

Almanza says that soap and water are the best way to clean your hands. Hand sanitizer cannot and should not be a direct replacement.

However, they are a useful alternative. To effectively kill bacteria, studies recommend that people use sanitizers that are at least 60 percent alcohol. Also, sanitizers won’t work if you have dirty hands, so wipe them with a tissue or napkin before sanitizing.

What about antibacterial soaps?

Research has shown that regular soap is just as effective as antibacterial soap in reducing bacteria-related illnesses.

In fact, some consumer antibacterial soap may increase some bacteria’s resistance to antibiotics(抗生素), making them more dangerous.

Other studies show that overly clean environments will negatively affect children by preventing their immune(免疫的)system development. Children need to fight off common germs to develop their immune systems.

1.What do we know about antibacterial hand sanitizers?

A.Most work similarly to hand soap.

B.Most use alcohol to kill the bacteria.

C.Most can’t remove oil on our skin.

D.Most bring more bacteria to people.

2.What problem does the research find about the manufacturers’ claim?

A.Their conclusion isn’t drawn from real-life environments.

B.Manufacturers don’t test their products before selling them.

C.Their products don’t kill the bacteria people usually have.

D.Manufacturers don’t tell the public how they get their conclusion.

3.Which is the first choice to clean your hands, according to Almanza?

A.Wet tissue.

B.Hand sanitizer.

C.Hand soap and water.

D.60 percent alcohol and water.

4.What does the text tell us about antibacterial soaps?

A.Some contain dangerous antibiotics.

B.They kill more bacteria than regular soaps.

C.They might be harmful for children’s development.

D.Some are proved to increase the amount of bacteria.

 

1.B 2.A 3.C 4.C 【解析】 本文是说明文。文章分析了有关使用抗菌洗手液的一些问题,并提出了建议。 1. 细节理解题。根据How do hand sanitizers work?部分的说明中“Most sanitizers are alcohol-based; they work by removing the outer layer of oil on our skin, then the alcohol kills the bacteria.”可知,大多数消毒液都含有酒精,是通过去除皮肤表面油脂,然后酒精杀死细菌。 故选B项。 2. 推理判断题。根据How can manufacturers make the 99.9 percent claim(声称)? 部分的说明中“In this controlled environment, hand sanitizers do kill 99.9 percent of bacteria. However, the human hand is a lot more complex and goes through a lot of different changes in a day compared to a controlled surface.(在这种受控环境下,洗手液确实能杀死99.9%的细菌。然而,与受控表面相比,人手要复杂得多,一天之内要经历很多不同的变化。)”可以推断,制造商得出的结论是来自于受控环境,不是来自现实生活环境。故选A项。 3. 细节理解题。根据Hand sanitizer VS hand soap and water 部分的说明中“Almanza says that soap and water are the best way to clean your hands.”可知,Almanza认为洗手的第一选择是洗手液和水。 故选C项。 4. 推理判断题。根据文章最后一段中“Other studies show that overly clean environments will negatively affect children by preventing their immune(免疫的)system development. (研究表明,过度清洁的环境会阻止儿童预防免疫系统的发展,对儿童的成长有负面影响。)”因此可以推断,抗菌肥皂对儿童的成长可能会有害。 故选C项。
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