Question

We’re surrounded by chemistry in everyday life. Sometimes it is easy to see, like when your science teacher does a big experiment in class. At other times, it can be pretty hard to see everyday chemistry at work, but nearly everything you touch or use has some element of chemistry in it.

Something as simple as toothpaste contains at least three chemicals, if not more. It is the mixture of them and its chemical reaction that keeps your teeth clean. Other things you use every day are created by chemistry, such as hair products, shampoo and soap. Adding detergent (洗涤剂) to water involves chemistry. Without chemistry, we would never have known that we need soap to get the oil out of clothes or skin. Chemistry not only helps us make products for use, but it also helps us understand the world around us. Chemistry helps us understand what the ozone layer (臭氧层) is and how it protects us.

Chemistry also gives us sunscreen to protect us from the sun. Thanks to chemistry, we know bleach (漂白剂) can’t be mixed with vinegar, because it can produce poisonous gas. Without chemistry, we wouldn’t have fireworks displays on important days.

Chemistry plays a big role in food preparation. Cooking food causes it to go through a chemical change. That is why cooked food often tastes different from raw food. Baking is a great example of chemistry. Too much or too little of any ingredient makes a difference to the result of baking, for example, the dough (面团) won’t rise or the cake will be flat.

Chemistry isn’t something that just lives in a lab; it’s something that you meet hundreds of times every day. Knowing how chemistry works will give you a greater understanding of the science behind some of the simplest looking things.

1.What’s the main idea of Paragraph 1?

A. Chemistry is easy to see around us.

B. Sometimes chemistry is hard to see around us.

C. How a science teacher does a big experiment.

D. Few things in everyday life contain chemistry.

2.The following actions are about chemistry EXCEPT _____.

A. cleaning teeth with toothpaste

B. washing hair with hair products

C. using soap to get the oil out of clothes

D. washing your face with water

3.The underlined word “poisonous” in Paragraph 3 means _____.

A. harmful B. healthy

C. fresh D. pleasant

4.Which one is TRUE according to Paragraph 4?

A. One can’t find chemistry when cooking food.

B. Chemistry plays an important part in food making.

C. That dough rises is nothing to do with chemistry.

D. A flat cake is the result of too many ingredients.

5.Which of the following would be the best title for the text?

A. Chemistry around the House

B. Chemistry in Science

C. Chemistry for Dinner

D. Chemistry in Everyday Life

Answer 1

1.B

2.D

3.A

4.B

5.D

【解析】

试题分析：人们的日常生活中充满了化学反应。化学反应有时候很容易观察到，有时候却难以察觉。几乎所有我们触摸到的或使用的东西都含有某种化学物质。牙膏、护发产品、洗发水和肥皂等生活用品中都含有化学物质。

1.At other times, it can be pretty hard to see everyday chemistry at work, but nearly everything you touch or use has some element of chemistry in it”可知，第一段主要讲的是化学物质很难被观察到，故选B。

2.It is the mixture of them and its chemical reaction that keeps your teeth clean.”可知，牙膏含有的化学物质发生反应后有清洁牙齿的作用，排除A；根据第二段第三句“Other things you use every day are created by chemistry, such as hair products, shampoo and soap.”可知B项正确；根据第二段第五句“Without chemistry, we would never have known that we need soap to get the oil out of clothes or skin.”可知C项正确；用清水洗脸不包含化学反应，故选D。

3.Thanks to chemistry, we know bleach (漂白剂) can’t be mixed with vinegar多亏有了化学，我们才知道漂白剂不能与醋混合，因为那样会产生有毒气体，由此可知，划线词的意思是“有毒的”，故选A。

4.Chemistry plays a big role in food preparation. Cooking food causes it to go through a chemical change. ...Too much or too little of any ingredient makes a difference to the result of baking,”可知，第四段主要讲的是化学在做饭或食品制作中发挥着重要的作用，故选B。

5.We’re surrounded by chemistry in everyday life. Sometimes it is easy to see,...At other times, it can be pretty hard to see everyday chemistry at work,”和最后一段“Chemistry isn’t something that just lives in a lab; it’s something that you meet hundreds of times every day.”可知，文章主要讲的是人们日常生活中的化学，故选D。

考点：生活类短文阅读