Put an ice cube from your fridge into a glass of water. You have a piece of string(线) 10 centimeters long. The problem is to take out that piece of ice with the help of the string. But you must not touch the ice with your fingers.
You may ask your friends to try to do that when you are having dinner together. There is a saltcellar on the table. You must use salt when you carry out this experiment.
First you put the string across the piece of ice. Then put some salt on the ice. Salt makes ice melt(融化). The ice round the string will begin to melt. But when it melts, it will lose heat. The cold ice cube will make the salt water freeze again. After a minute or two you may raise the piece of string and with it you will raise your piece of ice!
This experiment can be very useful to you. If, for example, there is ice near the door of your house, you must use very much salt to melt all the ice. If you don’t put enough salt, the water will freeze again.
1. We must use _______ when we carry out this experiment.
A. fridge B. some food C. a table D. some salt
2. How long will it take to carry out this experiment?
A. More than three minutes. B. Five minutes or so.
C. Only one minute or two. D. About ten minutes.
3.What is the task of this experiment?
A. Put the ice cube into the glass of water with the help of the string.
B. Take out the ice cube in the glass of water with the help of the string.
C. Take out the ice cube in the glass of water with your fingers.
D. Put some salt on the ice cube and then put the string across it.
4.How many things at least are used in this experiment?
A. Three. B. Four. C. Six. D. Seven.
5.We can learn something about _______ from the passage.
A. physics B. biology C. chemistry D. maths
If you go into the woods with your friends, stay with them. If you don’t, you may get lost. If you do get lost, though, this is what you should do. Sit down and stay where you are. Don’t try to find your friends—let them find you. You can help them to find you by staying in one place.
There is another way to help your friends or other people nearby to find you. Give them a signal by shouting or whistling three times. Stop. Then shout or whistle three times again. Any signal given three times is a call for help. You will be helped by others.
Keep up the shouting or whistling, always three times together. When people hear you, they will know that you are not making noise for fun. They will let you know they have heard your signal by giving two shouts, two whistles or two gunshots. When a signal is given twice, it is an answer to a call for help. If you don’t think that you will get help before night comes, try to make a little house with branches, lots of leaves and grass.
What would you do if you get hungry or need drinking water? You have to leave your little branch house to look for a brook. Don’t just walk away. Pick off small branches and drop them as you walk so that you can find your way back.
The most important thing to do when you are lost is--- stay in one place.
36. How do you let people believe that you are not just making noise for fun?
A. Stop now and then. B. Shout at the top of voice again and again
C. Go on shouting or whistling. D. Shout or whistle three times once in a while.
37. What does the underlined word “brook” mean?
A. 小 溪 B. 沙漠 C. 山峰 D. 大海
38. Which of the following is an answer to a call for help?
A. A whistle B.Three shouts C. Two gunshots D.Repeated loud shouts
39.If you feel thirsty when you are lost in the forest, what should you do?
A. Leave your branch house and walk away B. Light a fire and make yourself some tea．
C. Go to find a brook and leave branches behind you. D. Find something to hold the water.
40. What’s the best title for the passage?
A. What Do Three Shots and Two Shots Mean in a Forest
B. What to Do If You Get Lost in a Forest
C. How to Find Your Friends When You Are Lost in the Woods
D. The Most Important Thing to Do is to Stay in One Place
阅读下面短文，从短文后各题所给的四个选项（A、B、C、和D）中，选出可以填入空白处的最佳选项。
Have you ever had problems in your life and don’t know how to be happy? If 16 , you will find “Being a Happy Teenager” written by an Australian writer, Andrew Matthews, 17 .In his book, Matthews 18 us how to have a happy life and answers the 19 of teenagers.
Many people may 20 teenagers’ life, such as parents and friends, and the book 21 that we should stop being angry and forgive. The book tells us of useful skills, 22 how to change what you have learned into pictures of your mind to 23 your memory better.
Many teenagers think 24 happiness comes from either a good exam result 25 praise (赞扬) from other people. But you can 26 be happy when there are no such “good” things.
Success also comes from a 27 attitude. If you 28 from problems, you will have success in the future. Some students may often feel 29 when they are too tall or too short. But Matthews tells us that 30 comes from thinking about things in a positive 31 . If you are 32 , people notice you and you can get a 33 view(视线) of what is around you; if you are short, your clothes and shoes 34 less space in your bedroom! This is Matthews’ most important 35 : you choose to be happy!
1.A. so B. such C. it D. this
2.A. easy B. funny C. useful D. simple
3.A. orders B. tells C. asks D. allows
4.A. questions B. problems C. ideas D. comments
5.A. impress B. cause C. effect D. affect
6. A. suggests B. writes C. reads D. asks
7.A. for example B. such as C. for instance D. as before
8.A. make B. have C. take D. get
9.A. what B. which C. that D. whether
10.A. and B. but C. so D. or
11.A. never B. already C. still D. forever
12.A. confident B. positive C. common D. normal
13.A. learn B. suffer C. hear D. separate
14.A. frightened B. shocked C. confused D. worried
15.A. attitude B. intelligence C. failure D. altitude
16. A. way B. route C. style D. spirit
17.A. short B. small C. tall D. fat
18.A. longer B. higher C. bigger D. better
19.A. take up B. put up C. set up D. break up
20.A. class B. lesson C. education D. advantage
The music was so _______ that everyone present felt ________ at it.
A. excited…exciting B. exciting…excited C. excited…excited D. exciting…exciting
Our school basketball team won the championship (冠军), ______ cheered all of us up.
A. that B. which C. what D. it
--Excuse me, how can I get to the nearest hospital?
--Sorry. I’m a stranger here.
-- _______.
A. Thanks a lot. B. That’s a pity. C. Thanks anyway. D. I’m sorry to hear it.
