An INTERESTING experiment
It takes a little skill to do this experiment, but the result is truly SURPRISING.
What do you need? Several rubber balloons Wooden skewer（木签） Vegetable oil Paper towel |
| Step l Blow up a balloon, let some of the air out of it, and tie it closed. |
| Step 2 Rub some oil on skewer with paper towel.
| |
| Step 3 Gentle twist（搓捻）and push skewer into end of balloon opposite the knot. If balloon pops（爆 炸），go back to Step 1. | |
| Step 4 When skewer is in balloon, slowly twist and push it out of balloon near knot. | |
What will happen? |
| ____▲______ The balloon does not pop, even though it has a skewer in it. |
Why won’t it pop? | Rubber is made out of long chains of molecules （分子）. The skewer pushes these molecules aside. The molecules mix with the oil and they stick together tightly. The oil on the skewer seals the hole and air cannot get out. |
1.Which is the most suitable word for “ ▲ ”?
A.Topic B.Result C.Step 5 D.Reason
2.What can we infer（推断）from the passage?
A.It’s easy to push a skewer into and out of a balloon when doing the experiment.
B.You’d better blow as much air as possible into a balloon to make it big enough.
C.There’s no need for you to use the oil and paper towel while doing the experiment.
D.It’s hard for the air to get out of the hole as molecules and oil stick together.
1.How many chapeters are there in the Contents?
A.98 B.6 C.5 D.7
2.What's the main idea of "How It All Began"?
A.Pancakes have a long and interesting history. B.Pancakes are made from butter and eggs.
C.People needn't make pancakes today. D.Pancakes were eaten only in the past.
请认真阅读下面短文，从短文后各题所给的A, B, C, D四个选项中，选出最佳选项。
On a trip to California, my family stopped for lunch. As we walked toward the entrance to the restaurant, a man with messy and dirty hair opened the door for us and greeted us in a friendly way.
Once inside, my daughters whispered, “Mum, he _________.” After we ordered our lunch, I told the kids to look _________ the appearance. The day I became a mother, I had decided to set a good example for my children. Sometimes when things didn’t go right, being a good example was hard. When our meal arrived, I realized I had left the car-sick pills in the truck. With the windiest(蜿蜒的) trip ahead, the _________ needed them, so I went for them.
Just then, the “doorman” was opening the door for a couple. They rushed past him without even looking at him. Letting them in first, I said a loud “thank you” to him as I was drawing near.
When I returned, we talked a bit. He said he was not allowed inside _________ he bought food. I went back and told my family his _________. Then I asked our waitress to add one soup and sandwich. The kids looked at me _________ as we had already eaten. When I said the order was for the “doorman”, they smiled. When it was time to _________ our trip, I noticed the “doorman” enjoying his meal. Upon seeing me, he stood up and thanked me heartily. He then _________ his hand for a handshake and I gratefully _________. I suddenly noticed the tears in his eyes.
While we can’t choose many things in life, we can choose when to show thanks. I said thanks to a man who had __________ helped open a door for me, and also said thanks for that chance to teach my children by example.
1.A.smokes B.smiles C.tastes D.smells
2.A.beyond B.over C.around D.into
3.A.kids B.couple C.man D.waitress
4.A.before B.unless C.though D.since
5.A.story B.purpose C.experience D.requirement
6.A.in turn B.in danger C.in doubt D.in fear
7.A.make B.start C.take D.continue
8.A.reached B.washed C.raised D.gave
9.A.pushed B.accepted C.missed D.refused
10.A.carefully B.simply C.specially D.patiently
—Do the dishes, Mike, or I will tell mum!
—_____________, Sue!
A.Mind your own business B.You are welcome
C.It’s your duty D.Never mind
—________ hard work it is!
—Yes, but he seems _____ to do it.
A.What a, happy B.What, happy C.What a, happily D.How, happy
--What did he ask on the phone just now?
--He wanted to know ___________.
A.when the meeting will start B.what I was going to say at the next meeting
C.how long would the meeting last D.who is the host of the meeting
