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Everything is made of something.Nothing is made of nothing.

Chemistry is about the smallest things that other bigger things are made of,and what happens when theychange.The word chemistry comes from chemical,which is an example of one type of the very small things that other bigger things are made of.The words you are reading now are made of a dark liquid called ink (墨水),which is written on paper.The paper itself is made out of the chemicals that wood is made out of.Both the ink and the paper were made by different chemical processes.A chemical process is what happens when chemicals come together to make other chemicals,and therefore other things.

Cooking makes chemical changes.Your different ingredients are made of different chemicals,and when you put them together and make them hot and cook them,the chemicals change into new chemicals and the different ingredients make something new.That tomato sauce you're making is made of tomatoes,onions,garlic,salt and pepper.Those ingredients each have their own chemicals and their own flavors,but now with your sauce you've made something different,something that has its own flavor,all the ingredients mixed together,all the chemicals mixed together,something new.

You can smell the chemical changes,too,as they go up into your nose,especially when you forget about your sauce and it doesn't just cook but bums and becomes black and has a really bad flavor.You can't make it better,either,because once chemicals change,they can't be changed back again.

(1)What does the underlined word "they" in Paragraph 2 refer to?   

A.

Chemistry.

B.

Chemical.

C.

The smallest things.

D.

The bigger things.

(2)What is a chemical process?    

A.

Ink is written on paper.

B.

Paper is made out of wood.

C.

Everything is made of something.

D.

Things mixed together produce something new.

(3)What does Paragraph 3 mainly talk about?   

A.

How to make tomato sauce.

B.

What to use to form new things.

C.

Ingredients and their own flavors.

D.

Chemical changes in cooking food.

(4)Which might be the best title for the text?   

A.

What chemistry is like.

B.

Chemistry changes everything.

C.

Where the word chemistry comes from.

D.

A chemical process is called chemistry.

科目 英语   题型 阅读理解   难度 中等
知识点: 判断推理 科普知识类阅读 内容归纳 文中细节
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相关试题

As we know, some children live in the countryside, and some live in the city. Their lives are a little different, but they also have many of the same dreams.


In the countryside
In the city
Ways of going to school
On foot or by bike
By bus or car
Teaching tools
Recorders(录音机) and radios
DVD, TVs, recorders, radios, loud-speakers, CAI
Eyesight
Less than 45% are near-sighted(近视)
About 75% are near-sighted
After-class activities
Playing with balls
English corners and other school clubs
Homework
Homework can usually be finished at school
Homework never ends
Chores(杂事) to do
Washing, cleaning, farming, looking after younger sisters or brothers, cooking
Usually no chores
Family
Big families
Small families
Dream jobs
Teachers, drivers, scientists, nurses…
Scientists, doctors, computer programmers, managers …


The survey was done among the ______ between the countryside and the city.

A.parents B.students
C.teachers D.drivers

The children in the city usually do ______ according to the survey.

A.cooking B.cleaning
C.washing D.no housework

About ______of children in the countryside have good eyesight, while _____ of children in the city have good eyesight.

A.55%; 25% B.45%; 25%
C.45%; 75% D.55%; 75%

Which of the following is RIGHT according to the survey?

A.A classroom in the countryside often has TV sets.
B.Children in the countryside often join the school clubs.
C.Children in the city often have much homework to do.
D.Children in the city often have big families.

Students in many countries are learning English. Some of these students are small children. Others are teen-agers. Many are adults(成年人). Some learn at school, others by themselves. A few learn English by learning the language over the radio, on TV, or in film. One must work hard to learn another language.
Why do all these people want to learn English? It is difficult to answer this question. Many boys and girls learn English at school because it is one of their subjects required for study. They study their own language and maths and English: Some people learn it because it is useful for their work. Many people learn English for their work. Many people learn English for their higher studies, because at college or university some of their books are in English. Other people learn English because they want to read newspapers or magazines in English.
Different kinds of people want to learn English ____________.

A.together with other subjects
B.for different reasons
C.for their work
D.for higher studies at colleges

From this passage we know that ____________.

A.we can learn English easily
B.English is very difficult to learn
C.English is learned by most people in the world
D.English is a useful language but one must work hard to learn

Why do many boys and girls study English?

A.Because at college or university some of their books are in English.
B.Because it is useful for their work.
C.Because it is one of their subjects required for study at school.
D.Because they want to read newspapers or magazines in English.

If you really want to see that number on weight loss, what you put in your mouth matters most. People who simply cut calories to lose weight lose about 2 pounds a week, says a study in the International Journal of Obesity and Related Metabolic Disorders. At the same time, people who exercise but don't cut calories drop less than half a pound each week.
Why doesn't the physical activity produce the same pound-dropping results as calories cut? One thought is that though exercise burns calories, it doesn't increase your metabolism (新陈代谢), says a study in Obesity Reviews. It doesn't prevent your metabolism from slowing as you lose pounds. As you slim down - through any method - your metabolism slows with your weight loss and exercising doesn't keep that from happening. As you lose weight, you burn fewer calories through exercise. For example, a 150-pound person who exercises for 30 minutes burns about 306 calories. After losing 10 pounds, that person will burn about 286 calories doing the same exercise. So to burn 306 calories, you need to extend (扩大) your exercise.
A research shows people who diet and exercise for weight loss drop the same amount of weight as people who have a balanced diet. They are, however, more successful keeping the weight off than their counterparts (相当的人) who simply eat less.
What does the underlined sentence mean?

A.If you want to put on weight, you should eat more.
B.If you want to lose weight, you should eat more.
C.If you want to lose weight, you should have a balance diet.
D.If you want to lose weight, you should exercise more.

Why can't the physical activity help people lose the same weight as calories cut?

A.Because it doesn't increase metabolism.
B.Because it doesn't burn calories.
C.Because it bums less calories than calories cut.
D.Because calories cut slows metabolism.

What does the underlined word "it" refer to in this passage?

A.Diet. B.Exercise.
C.The calorie. D.Metabolism.

According to the passage, which of the following is TRUE?

A.The physical activity is the most useful to lose weight.
B.As you lose weight, you bum more calories through exercise.
C.Doing exercises has the same effect with diet.
D.People who exercise but don't cut calories will lose less weight.

What's the main idea of this passage?

A.How to lose weight.
B.How to diet.
C.People who like sports can easily lose weight.
D.People who have a balanced diet can lose weight easily.

Popular breakfast foods in the United States, as in many other countries around the world, include coffee, milk, juice, eggs and bread. Some other breakfast items served in the United States are thought by many to be traditionally American. However, they actually come from other countries.
A very popular breakfast food in America is the pancake---a thin, flat cake made out of flour and often served with maple syrup. The idea of the pancake is very old. In fact, pancakes were made long ago in ancient China.
Bagels, a round thick bread with a hole in the middle, are also popular for breakfast in America. Polish people in the late 1600s came up with the idea for the first bagels and this new kind of bread soon took off across Eastern Europe.
In the late 1800s, thousands of Jews from Eastern Europe traveled to the United States and brought the recipe for bagels with them. Today, New York bagels are said to be the best in the world. Many people have them with cream cheese for breakfast on the go.
Doughnuts (usually spelled “donut” in the United States) came from France. They were served to American soldiers in France during World War Ⅰ(第一次世界大战). After the war, American soldiers asked cooks in the United States to make doughnuts for them. Now, served with coffee, they are a very popular breakfast food across the United States.
This reading is mainly about _______.

A.famous places in the United States to eat breakfast
B.popular American breakfast foods coming from China
C.the most popular types of pancakes in the United States
D.the history of popular breakfast foods in the United States

Which of the following is TRUE for both bagels and donuts?

A.They both came from Europe.
B.They are both easy to make.
C.They are both sweet.
D.People in New York make them best.

Who brought bagels to America?

A.Polish people. B.Jewish people.
C.Chinese people D.American soldiers.

Which of the following is true about doughnuts?

A.It was first made by the French.
B.The soldiers invented them in World War I.
C.Only soldiers eat them in the Untied States.
D.It is round with a hole in the middle.

This passage tells us that ________.

A.the Americans like to eat sweet foods for breakfast
B.all American foods come from other countries
C.not all American foods are really American
D.very few Americans have breakfast every day

This is a world filled with all kinds of products. Though they belong to different kinds of brands (商标), they are usually thought to be symbols of an easy and convenient life. We can hardly imagine what our life will be like without any of them. So how much do you know about these excellent products?

Brands
Prices (yuan)
Materials
Used for
Places of
production

iPhone6
5,023-7,590
steel
and
plastic
communicating
and
having
much
fun
America

LV handbag
25, 999
cloth,
steel
and
leather
filling
with
some
small
objects
(物体)
France

Longines watch
12,750
steel,
silver
and
leather
showing
the correct
time
Switzerland

HAVALH6 (car)
119, 800
steel,
plastic
and
leather
travelling
far and
fast
China

Which product is the most expensive?

A.iPhone 6 B.LV handbag.
C.Longines. D.HAVAL H6.

Which material is used for making all these products?

A.Plastic. B.Steel.
C.Leather. D.Silver.

Which product may suit you when you feel bored?

A.The mobile phone B.The handbag.
C.The watch. D.The car.

Which country is NOT mentioned in the passage?

A.China. B.Germany.
C.France. D.America.

What can we know from the passage?

A.Switzerland is famous for nice LV handbags.
B.HAVAL H6 is made in both France and China.
C.Longines can help you know what time it is now
D.An iPhone 6 can be used for filling with your school things.

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