Have you ever wondered how a kite stays in the air? Wind is very important but so are two scientific words: gravity(重力) and lift(举力).

When something is in the air, gravity is what pulls something back to the ground. _______ you throw a ball in the air, it comes back down because of gravity. When leaves ____ trees onto the ground, that’s gravity. When you put a kite in the air, gravity wants to bring it ____ . Then what keeps it up? Wind! Wind creates lift.

Lift is what happens when wind pushes against something and carries it up. When a plastic bag gets caught in the wind, lift is what causes it to rise into the air. When you put a silk scarf ____ a fan, lift causes ____ to wave(摆动). An object’s lift depends on the size of its surface or its area. A piece of _____will float(漂浮)in the wind, but it won’t float if you make that paper into a ball. That’s because you’ve made the surface smaller.

To find out if there is enough wind to fly a kite, go outside and look up. If you ______leaves dancing on trees or flags waving sideways, it’s ____ good kite-flying weather. When the wind is strong enough to move a flag, it’s moving ____ 7 to 18 miles an hour. That’s just ____ to lift a common kite.

1.A. Which B. What C. When D. Where

2.A. take off B. get off C. keep off D. fall off

3.A. up B. down C. off D. out

4.A. in the middle of B. n the front of C. at the back of D. in front of

5.A. t B. them C. this D. that

6.A. bread B. cake C. card D. paper

7.A. hear B. see C. smell D. feel

8.A. probably B. finally C. quickly D. hardly

9.A. on B. at C. in D. by

10.A. wrong B. favourite C. right D. strange

请认真阅读下面短文并用英语回答问题,将答案写在横线上。

Mother Teresa once said, "Every time you smile at someone, it is an action of love, a gift to that person" However, a recent survey showed that 25% of Chinese never smiled or smiled less than five times a day. It also found that 2~6 of Chinese were willing to smile at strangers.

To make a change, forty students from Shanghai Normal University started a team of "Smiling Volunteers". Their first smiling task was-to smile at all the visitors in the Shanghai Film Art Centre and ask if they needed their help. Not all students found it easy to smile all the time. "When volunteers help other people, smiling is the best way to make them understand that volunteers are ready and sincere(诚挚的),”one team leader said.

A teacher in charge of(负责)the team thought the team's work was not all fun and games. "Most of our students will be teachers after they leave university. Smiling is necessary for good teachers. We hope they can learn how to smile at each other, she said. Everyone smiles in the same language. So it's not important whether you are a teacher or not. After all, sincere smiling and helping hearts are the most important. If today you don't start a day with a smile, it won't be too late to start practising for tomorrow. Remember "The world always looks brighter from behind a smile."

1.How many Chinese never smiled or smiled less than five times a day?

2.What will most of the students be after they leave Shanghai Normal University?

3.Do you think smiling is necessary in your life? Why or why not?

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网