WHAT YOU"LL NEED:
● Soap ● Water ● Your hands!
WHAT TO DO:
1. Make sure your hands are dry.
2. Rub your hands together until you feel the heat of your hands.
3. Now, use soap and water to get your hands very slippery (滑的).
4. Try to make friction happen while your hands are slippery.
5. Please write down what has happened.
LET"S TALK!
Friction is an energy that happens when two things rub together. When friction happens,
it makes heat! When your hands are slippery, they won"t make very much friction and your
hands won"t get so hot.
DID YOU KNOW?
1. Friction happens when you stop your fast running bike.
2. Ancient people made fires by rubbing two pieces of wood together. Friction happened
though they didn"t know it.
_________
Friction is everywhere. Have you ever noticed situations where friction is happening?
If not, ask your parents to take you out in a car. If it is not too hot, touch the tires (轮胎)
of the car before and after a short drive to see how much warmer they get from friction. |
| 1-5 BADDA |
核心考点
试题【阅读理解。 Have you ever rubbed your hands together when they get cold? Why do we】；主要考察你对 日常生活类等知识点的理解。 [详细]举一反三
| 阅读理解。 |  What are the most successful movies?
American movies are the most popular around the world. The most successful movies of
the twentieth century wad Titanic. People around the world paid almost $2 billion, and they saw
the famous ship sink again. Titanic was more popular than Star wars. This Star Wars film made
almost $1billion in the late 1990s. Close behind this was Jurassic Park, a film about dinosaurs.
And it"s interesting that Titanic was also the most expensive film: it cost $200 million to make. |  Which is the world" s most popular sport?
The world most popular sport is or soccer. It"s more popular than football, basketball, or
baseball. FIFA has 4.1 million teams, and 200 million players in l90 countries around the world.
More than one billion people watch the World Cup Final on TV every four years. In the United
States, soccer is not the most popular for spectators (观众), but it is the most popular sport for
kids and teens. About 3 million Americans under the age of nineteen play soccer. | 
What are the largest shopping malls?
The largest shopping mall in the world is the West Edmonton Mall in Edmonton, Canada.
The mall has more than 800 retail stores, including eight department stores. There is also a 335
room hotel It"8 much; larger than the 8econd largest mall in the world: this is the mall of America
in Bloomington, Minnesota. The US mall has 400 stores. Its amusement attractions include a
roller coaster. Some people spend their vacation at this mall．But in the future,the biggest stores
probably are going to be on the computer: some online malls already say that they have stores in
l00 countries. | | 阅读理解。 | Earthquakes are hard to predict, but do you know what to do before, during and after an earthquake?
Here"s some advice:
Before an earthquake It"s necessary to prepare yourself and your family. All family members should
know how to turn off gas, water and electricity and know useful telephone numbers (doctor, hospital, police,
119, etc.). Never put heavy things over beds.
During an earthquake It"s important for each of you to stay calm. If you are indoors, quickly move to a
safe place in the room such as under a strong table. The purpose is to protect yourself from objects, stay away
from windows, large mirrors, heavy furniture and so on. If you"re cooking, turn off the gas. If you"re outdoors, move to an open area like a playground. Move away from buildings, bridge and trees. If you are driving, stop
the car as soon as possible, staying away from bridges and tall building. Stay in your car.
After an earthquake Once the shaking has stopped, DO NOT run out of the building at once. It"s better to
wait and leave when it"s safe. Check around you and help the people who are in trouble. If your building is
badly broken, leave it. If you smell of hear a gas, get everyone outside and open windows and doors. If you
can do it safely, turn off the gas. Report it to the gas company. | | 1. Which of the following is mentioned in the second paragraph? | A. People should know how to turn on gas.
B. People should now how to save water.
C. People shouldn"t put heavy boxes over beds.
D. People shouldn"t forget the phone numbers of others. | | 2. When an earthquake happens, _________ can help you deal with it. | A. standing still
B. staying calm
C. looking outside
D. moving indoors | | 3. During an earthquake, if you are driving in an open area, you should _________. | A. speed up your car
B. stop your car and stay in
C. slow down your car
D. stop your car and run out | | 4. When the earth stops shaking, you should _________. | A. check around you first
B. run out of the building at once
C. break the windowns and doors
D. write a report to your company | | 5. You can learn _________ after reading the passage. | A. what an earthquake is like
B. what to do to avoid an earthquake
C. how an earthquake happens
D. how to protect yourself in an earthquake | | 阅读理解。 | People know the dangers of fires. It"s good for a family to learn how to prepare for a fire. Here are sonic
suggestions:
Put a smoke a1arm in the house. Smoke from a fire causes the alarm to go off The alarm makes a loud
sound. The sound tells everyone to leave the house at once.
Make escape (逃脱) plans. They should know all the ways out of the house. If there is a fire, everyone
follows the plan to get out. Part of the plan is to check all the windows to make sure they can be opened
easily.
Buy fire extinguishers (灭火器) in the house, Everyone in the family should know how to use them.
Practise for a fire. They do fire practice because they teach children about fire safety. Everyone in. the
family should know the following fire rules:
★ Don"t open a hot door! The tire can grow more quickly if you open the door.
★ Stay close to the floor! Smoke can be more dangerous than fire, The best air is near the floor because
smoke rises.
★ What will you do if your hair or clothes start to burn? First, stop! Don"t run! The fire burns faster
because of more air. Drop! Fall to the floor. Then roll! Turning over and over will make the fire go out. Put
a blanket (毯子) around you to keep air away from the fire that may still be on you.
There are many possible causes for fires. A wise family is ready all the time. If there is a fire, don"t forget
to call 119 for help. | | 1. What does it mean when a smoke alarm rings at home? | A. You have to get up.
B. Water is running to the floor.
C. Something is burning.
D. Someone breaks your window. | | 2. The writer advises people to do the following to prepare for a fire except that _________. | A. they practise for a fire
B. they make escape plans
C. they buy fire extinguishers
D. they use electrical cookers | | 3. When a fire happens, _________ if you open the hot door. | A. the fire will grow more quickly
B. the electricity will be cut off
C. the door will soon be on fire
D. the house will fall down | | 4. What are the right steps you should take when your hair or clothes catch fire? | A. Stop, run, roll.
B. Step, drop, roll.
C. Run, drop, roll.
D. Roll, drop, stop. | | 5. What is the best title for this passage? | A. The Dangers of a Fire.
B. The Causes of a Fire.
C. Learn to Use a Fire Extinguisher.
D. Be Ready for a Fire. | | 阅读理解。 | The expression "down to earth" means being open and honest. It is easy to get on with someone who
is down to earth. A down-to-earth person is the opposite of someone who acts important or proud.
Down-to-earth people could be important members of society. But they do not consider themselves to be
better than others who are less important. A person who is filed with his own importance and pride is said to
have his nose in the air.
Americans use another expression that is similar in some ways to down to earth. The expression is both
feet on the ground. Someone with both feet on the ground is a person with a good understanding of reality
(现实). He may have dreams, but he does not allow them to have influence on his understanding of what is
real.
The opposite kind of person is one who has his head in the clouds. Someone with his head in the clouds
is a person whose mind is not on what is happening in real life. Such a person may be called a day－dreamer.
When we have both our feet on the ground, and when we are down to earth, we do not have our noses
in the air. We act honestly and openly to others. Our lives are like the ground below us—solid (牢固的) and
strong. | | 1. A down-to-earth person could be _________. | A. social and proud
B. good and opposite
C. real and important
D. strong and changeable | | 2. The expression "has one"s nose in the air" means _________. | A. 眉飞色舞
B. 目中无人
C. 瞻前顾后
D. 春风得意 | | 3. This passage mainly talks about _________. | A. the use of some expressions
B. dreams and achievements
C. the lifestyle of honest people
D. honesty and understanding | | 4. If you want to understand what is real in life, you have to _________. | A. get along with other people easily
B. learn from those who are down to earth
C. be a good dreamer with quick mind
D. have both your feet on the ground | | 5. If you only consider your own importance, _________. | A. you"ll think you are better than others
B. your life will be like the solid and strong ground
C. you"ll be hated by down-to-earth people
D. your life will be filed with love | | 阅读理解。 | I usually get up at 5:00. I make coffee, go to my desk and work. When my boys get up, I"m theirs. I
follow the min to the kitchen and make them breakfast. While they"re eating, I make their lunch, pick out
their school clothes and get the little one dressed.
My wife takes them to school. I bring them home. I am not the only father at the school gate. The boys
and I walk the 12 blocks home unless the weather is terrible. Then we take the subway. I remind them of
looking out, like an animal looking after their babies.
At home, they play on the computer and the little one will draw, sometimes for hours. When their mother
comes home, they run to her. She has been in the official day and tired, but her attention is all on them.
I have made dinner. We sit down and eat together. After they do their homework, Karen takes them to
bed. I listen to the noise of the boys" and their mother"s voice.
One afternoon when we were on the way home from school, the boys and I stopped at the clothing store.
The saleswoman looked at the boys and said to me in a low voice, "You"re Mr. Mom, aren"t you?" I felt very
angry. I"m not Mr. Mom. That"s not how I look at myself. The boys have a mother, a wonderful mother.
She works outside the home, I work in the home. We are parents together. I"m a father! | | 1. The first paragraph talks about _________. | A. what the children have for breakfast
B. how busy the man is in the morning
C. why the man cooks lunch
D. when the children go to school | | 2. We know from the second paragraph that _________. | A. they take the subway to school when the weather is bad
B. the man drives a car and his wife walks to work
C. the man goes to meet the boys before school is over
D. it doesn"t take them long to arrive home | | 3. Paragraph 3 tells us that _________. | A. the children"s mother is very strict with them
B. the man"s wife works in an office very near the school
C. the children"s mother used to be back hours later than them.
D. the man has three or more children and the youngest loves drawing | | 4. We learn from the last two paragraphs _________. | A. what the saleswoman said has hurt the man a lot
B. before the children get to sleep, the man"s wife tells stories
C. what the man hast o do from morning to night everyday
D. the man"s wife is Karen and she talks a lot | | 5. This passage tells us _________. | A. never to call a man Mr. Mom
B. the man doesn"t enjoy working at home
C. something about the children"s school life
D. what kind of people the man and his wife are |
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