问题 填空题

綦江县的教育改革,激发了广大师生的热情,师生们克服了条件差,实验器材少的困难,充分利用废旧物品做了大量实验.例如,他们用废矿泉水瓶研究了多个问题.开动脑筋想一想,你一定能用矿泉水瓶做许多实验.请参照下面的示例,说出两个你准备探究的问题.

示例:将矿泉水瓶抛出,探究力和运动状态变化的关系.

(1)______.

(2)______.

答案

①用手指挤压矿泉水瓶,探究力和物体形状变化的关系;

②装不同质量的水放在沙盆中,探究压强与压力的关系;

③装相同的水并盖住,正倒放置在沙盆中,探究压强与受力面积的关系;

④向瓶中灌深度不同的水,探究音调与空气柱长度的关系;

⑤将瓶子竖直向上抛出,探究动能与重力势能的关系;

⑥将矿泉水瓶抛出,探究力和运动状态变化的关系;

阅读理解

阅读理解

     A well-dressed man entered a famous jewelry shop. He explained he wished to buy a pearl for his

wife's birthday and the price didn't matter since business had been very good for him that year. After

examining a nice black one that cost $5000, he paid for it in cash, shook hands with the jeweler, and left.

     A few days later the man returned and said that his wife liked the pearl so much that she wanted another one just like it. It had to be exactly the same size and quality, as she wanted a pair of earrings made,

"Can you give me any advice on how to get such a pearl?" said the man. The jeweler regretfully replied,

"I would say it's exactly impossible to find one exactly like that pearl."

     The rich man insisted that the jeweler advertise in the newspapers, offering $ 25,000 for the matching

pearl. Many people answered the advertisement but nobody had a pearl that was just right.

     Just when the jeweler had given up hope, a little old lady came into his store. To his great surprise, she pulled the perfect pearl from her purse. "I don't like to part with it," she said sadly, "I inherited it from my

mother, and my mother inherited it from hers. But I really need the money."

     The jeweler was quick to pay her before she changed her mind. Then he called the rich man's hotel to

tell him the good news. The man, however, was nowhere to be found.

1. The man paid $ 5,000 for the black pearl without bargaining because ______.

A. he wanted to make the jeweler believe him      

B. his business had been successful

C. he was anxious to get it      

D. he was very rich

2. He told the jeweler to get him another pearl that must be ______.

A. exactly the same size as the black one

B. exactly as big and nice as the black one

C. worth no more than $ 25,000

D. exactly the same quality as the black one

3. Many people answered the advertisement because they wanted _______.

A. to see the perfect pearl

B. to buy some beautiful pearls too

C. to get in touch with the rich man

D. to sell their own pearl at a high price

4. The jeweler couldn't find the man anywhere because ______.

A. he died suddenly.

B. He happened to be out

C. He got $ 20,000 by cheating and had run away with the money.

D. He wouldn't show up until the jeweler called him a second time.

问答题 案例分析题