Have you ever rubbed your hands together when they get cold? Why do we do that? We do that for friction. Friction happens when two things that aren’t very smooth rub together to make heat energy. The faster you rub two things together, the more friction (and heat) you can make. Let’s discover friction!
| 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. |
根据表格内容，选择正确答案。 You’d better make your hands to get heat when you rub them.
| A．slippery | B．dry | C．wet | D．smooth |
What does the word “friction” in this text mean in Chinese?
| A．摩擦 | B．冷却 | C．膨胀 | D．震动 |
is NOT an example of friction.
| A．Bike riding | B．Car driving | C．Hands rubbing | D．Friction discovering |
What’s the last column (栏目)?
| A．THINK IT OVER! | B．WHAT HAPPENED? |
| C．EVERYDAY ACTION: | D．WORK WITH PARENTS! |
This text is most probably .
| A．a science report | B．a car advertisement |
| C．a rubbing introduction | D．a chemistry programme |
阅读理解（每小题2分，共10分）
| Ｆｏｕｎｄ： Ａ ｂｌａｃｋ ｗａｔｃｈ Is this your watch? It is found in the classroom of Class 3, Grade 1. Please call Jessica at 36206018. |
| Ｌｏｓｔ： Ｍｙ ｓｃｈｏｏｌ ｃａｒｄ My name is David Hand. My school ID card number is 20070107. Please call me at 33429703 or my friend Judy. Her number is 33073061. Thank you! |
根据以上内容，选择最佳答案。_______ finds (找到) a watch.
A. David B. Jessica C. JudyWhat’s the color of the watch?
A. Black B.. White. C. Red.__________ school card is lost.
A. Jessica’s B. David’s C. Judy’sJane’s watch is lost; she should (应该) call ______________.
A. 33073061 B. 33429703 C. 36206018Tim finds(找到) David’s card; he should call ______________.
A. 20070107 B. 36206018 C. 33429703
I’m a Chinese boy. My name is Zhao Ming. I am in No. 34 Middle School. I am in Class 1.My English teacher is Mr. Wang. My Chinese teacher is Miss Wu. They（他们） are good teachers. I love them. I have a good friend. His name is Tom. He is an English boy. I love him, too.
根据短文内容，选择最佳答案。 Zhao Ming is a (an) ______ boy.
A. Japanese B. Chinese C. AmericanZhao Ming is in _____ Middle School.
A. No. 43B. No. 23 C. No. 34Miss Wu and Mr. Wang are _______.
A. students B. teachers C. girlsTom is Zhao Ming’s ______.
A. teacher B. friend C. classmateTom is a (an) ______ boy.
A. Chinese B. Japanese C. English
Linda: Hello, my name is Linda Brown. What’s your name?
Tony: I am Tony Smith. Nice to meet you!
Linda: Nice to meet you, too (也)! What is this?
Tony: Oh, it is a photo of my family.
Linda: Is this your mother?
Tony: Yes.
Linda: Is he your father?
Tony: Yes, he is.
Linda: And is the baby (婴儿) your brother?
Tony: Haha, it isn’t. It is my sister.
根据对话内容，选择正确答案。What is the boy’s last name?
A. Brown. B. Tony. C. Smith. What is the girl’s first name?
A. Linda. B. Tony. C. Brown.Tony has a photo of his __________.
A. parents B. school C. family Is the woman(妇女) Tony’s mother?
A. Yes, she is. B. No, she isn’t. C. We don’t know.Is the baby Tony’s brother?
A. Yes, it is. B. No, it isn’t. C. We don’t know（不知道）.
David Moore taught science at the City School. He needed some books, so he bought them. He left the books in his car in a quiet street. Then he went to buy some other things. At about six o’clock he came back to the car. One window was open and the books were not there! David had to drive to Fry Road.
That night he wrote a letter to a newspaper. The next day he went to the police station. On Friday people read this in the newspaper:
“Book: Do you have any old books? I buy old and modern books. Open all day on Saturday. David Moore, 26 Fry road.”
David stayed at home on Saturday. His first visitor came at eight o’clock. David took him to the kitchen. At half past nine another man arrived. He had a bag with him.
“Mr. Moore?” the man asked.
“That’s right,” David said. “Can I help you?”
“I’ve got some good books. You buy books, don’t you?”
“Yes, bring them in. I’ll have a look at them.”
Soon the books were on the table. “Come in now,” David called, “and bring the list.”
A policeman came into the room from David’s kitchen. They were just the same. “Come with me, sir,” the policeman said to the man. David’s first visitor was ______________.
| A．a student | B．a policeman | C．a reporter | D．a thief |
From the story we know that________.
| A．David was a good teacher |
| B．David was a clever man |
| C．The policeman knew the thief well |
| D．David worked hard |
How did David get his books back?
| A．A reporter found them and gave them to him. |
| B．David found them in his school. |
| C．He thought of a good way to catch the thief. |
| D．He found them at home. |
German scientists say that eating a little chocolate every day may keep you away from cardiovascular(心血管的) disease. The scientists have found that chocolate, especially dark chocolate , can help you cut down 39 percent of heart disease, including taking a very small amount . However, the study advises people not to eat too much chocolate, because too much chocolate is bad for our bodies. So the scientists advise people to eat small amount of chocolate instead of sugar or high-fat snacks.
Scientists said, “Dark chocolate shows the greatest effects, milk chocolate fewer , and white chocolate no effects.” The results showed chocolate may cut down blood pressure, but they also say that further study is needed.
In the eight-year study, people’s daily diet, exercise habits, and blood pressure were studied in 19,357 persons aged 35 to 65. They found that people who are an average of 7.5 grams of chocolate a day had a very lower chance of heart disease than those who ate much less chocolate , and average of 1.7 grams a day.It took the scientists __________ years to prove that small amount of chocolate is good for people.
| A．8 | B．35 | C．39 | D．65 |
In the study, scientists studied _______________.
| A．where chocolate came from |
| B．how chocolate was made |
| C．people’s daily diet, exercise habit and blood pressure |
| D．why people liked chocolate so much |
From the passage, we know that _________________.
| A．chocolate was popular in Germany before |
| B．chocolate is good for us, but we should not eat too much |
| C．eating 1.7 grams of chocolate each time is the best |
| D．people aged 35 had better not eat chocolate |