①Chemistry is everywhere in our daily life.Sometimes it's easy to see.At other times，it can be very hard to see the everyday chemistry at work，but nearly everything you touch has some chemicals（化学物质） in it.
②Chemistry helps to make products for use.Something as simple as toothpaste has at least three chemicals that keep your teeth clean.Other things in your daily life are created by chemistry，such as hair products and soap.Without chemistry，we would never have known that we need soap to get the oil out of clothes.
③Chemistry also helps us understand the world around us.Thanks to chemistry，we know bleach （漂白剂） can't be mixed with vinegar （醋），because the mixture can produce harmful gas.
④Chemistry 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 uncooked food.Too much or too little of any chemical material makes a difference to the result of baking （烘焙）.For example，the cake can be too soft or too hard.
⑤Chemistry isn't something that just lives in a laboratory，it's something that you meet hundreds of times in life.Knowing how chemistry works will give you a greater understanding of the life.
（1）What can the chemicals in toothpaste help us？
| A． |
To keep the teeth clean. |
| B． |
To make the teeth strong. |
| C． |
To clean the oil off clothes. |
| D． |
To make the clothes new. |
（2）From the third paragraph，we know that .
| A． |
we can mix bleach with vinegar |
| B． |
the mixture can produce useful gas |
| C． |
we can't mix bleach with vinegar |
| D． |
chemistry can't help us make products |
（3）The fourth paragraph mainly tells us that .
| A． |
cooked food isn't as good as uncooked food |
| B． |
chemistry plays a big role in food preparation |
| C． |
there are no chemical changes while we are cooking |
| D． |
the cake can't be too soft or too hard with chemistry |
（4）Which of the following shows the structure （结构） of the passage？ （①＝ Paragraph 1）
| A． |
|
| B． |
|
| C． |
|
| D． |
|
（5）What's the main idea of the passage？
| A． |
Chemistry and food. |
| B． |
Chemistry around the world. |
| C． |
Chemistry and products. |
| D． |
Chemistry in everyday life. |
Thousands of years ago， Shennong， who had an ox（牛）head and human body， lived in the south of ancient China． Seeing that local people were suffering from disease， he built ladders（梯子）and houses on a high mountain to store medical plants． To remember him， people named the place Shennongjia．
The story makes Shennongjia in Hubei an inviting place for tourists． Traveling there is a quite different experience， as you can see sceneries（风景）of the four seasons from different height．"When the bottom of the mountain is summer， the top is spring and while the foothill is autumn， the top is covered with ice，" local people say of the special climate of Shennongjia．
Shennongjia is also home to 5，000kinds of animals and plants． Many rare animals live there， such as the golden monkey and the Asian black bear．
One intersting thing about Shennongjia is its story of wild men． Some people said that they saw big foot marks． Yet so far， scientists haven't proved（证实）it is true and some say they are just bears．
The beautiful place has recently received a new title． It was added to United Nations World Heritage（遗产）list as a natural site． China now has 50world heritage sites， only less than Italy in the world．
46． According to Paragraph 1， Shennong ．
A． had an ox body
B． grew medical plants for people
C． helped people with illness
47． In Shennongjia， ．
A． there are 50，000kinds of animals and plants
B． people can experience four seasons up the mountain
C． people can climb ladders and get to the houses on a high mountain
48． " rare animals" are animals which are ．
A． big and dangerous
B． smart and expensive
C． not often seen
49． Scientists are not sure about ．
A． the story of Shennong
B． the truth of wild men in Shennongjia
C． the number of animals and plants in Shennongjia
50． Which of the following countries has the most world heritage sites？
A． Italy．
B． China．
C． The US．
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44． When will the walk begin？ B
A． At 10：00am．
B． At 10：30am．
C． At 11：00am．
45． From this text， we know that A ．
A． the walk is 5kilometers
B． the walk lasts for a month
C． children don't need to pay
41． Book signing means ．
A． 预订书
B． 签名售书
C． 打折书
42． What is the book about？
A． The life of Dr． Aaron．
B． How to work in the field．
C． The ants of New England．
43． Linda bought the book in June， so she saved ．
A． ＄3.00
B． ＄29.95
C． ＄56.90
Most people drink tea in the world．But tea does not mean the same thing to different people．In different countries，people have different ideas about drinking tea．
In China，for example，tea is often served when people get together．Chinese people drink it at home or in tea houses at any time of the day．They often use hot water to boil tea leaves．
Tea is also important in other Asian countries．People in these countries have a special way of serving tea．They hold a tea ceremony in their houses when important guests come．It is very old and fail of meaning．Everything must be done in a special way in the ceremony．There is even a special room for it in their houses．
In the United States，people usually drink tea at breakfast or they drink it after meals．Americans usually use tea bags to make tea．This way is faster and easier than the way of making tea in teapots．In summer，most Americans drink iced tea．They like to put some ice in their tea．
61．Do most people drink tea in the world？
62．What do Chinese people often use to boil tea leaves？
63．When do people usually drink tea in the USA？
64．What kind of tea do most Americans drink in summer？
65．What does the underlined word "It" mean？ ．
Homework is a problem for students all over the world．As a student，you have a lot of homework to do every day．（51） ．And it helps you understand important knowledge．Luckily，there're several things you can do to make homework less difficult．
（52） ．Write your homework down in your notebook if you need to．Don't be afraid to ask questions about it．Understand why you should do your homework．
（53） ．Many schools have study halls．The students can study there．It's more interesting to play with your friends．But the more homework you finish at school，the less you'll have to do that night at home．
（54） ．It is difficult to hold your attention for too long．So take some breaks while doing your homework．Taking a 15﹣minute break every hour is a good idea for most people．
（55） ．If you don't finish your homework at school，think about how much you have left．It's a good idea to make a homework plan，especially when you want to enjoy sports or other activities．
A．Be sure you understand the homework
B．Use some time to do homework at school
C．It's the best way to review what you have learned in class
D．Make a plan
E．Take a break
F．It's necessary for you to do more homework at home．
