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(醋), 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(成分,尤指烹饪)
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 mak-ing.
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