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Warm water freezes more quickly than col...

    Warm water freezes more quickly than cold water. Sir Francis Bacon said that almost four hundred years ago. But few people believed him until 1970. In that year a Canadian scientist George Kill proved the English professor was right. Dr Kill filled an open oil pail () with cold water. He filled another with warm water. He put both in the same low temperature. The warm water froze first. The lack of covers on the pails is the secret. Some of the warm water changed into vapor. This meant that less of the warm water was left to be frozen. And so the warm water froze faster than the cold water even though it had a greater temperature drop to make.

1.Hundreds of years ago, Sir Francis Bacon found _______.

A.the temperature of warm water drops faster than that of cold water

B.warm water is heavier than cold water

C.warm water has the same temperature as cold water

D.warm water is not as useful as cold water

2.Leave a pail with warm water and another pail with cold water in the same low temperature, you’ll find that _______.

A.cold water freezes first

B.warm water turns into ice before cold water

C.warm water and cold water freeze at the same time

D.much of cold water is changed into air.

3.Why does warm water freeze first in the same freezing weather? _______

A.Because some of the warm water turns to vapor, the amount becomes less than that of cold water.

B.Because warm water is lighter than cold water.

C.Because the temperature of warm water is lower than that of cold water.

D.Because cold water freezes with more difficulty than warm water.

 

1.A 2.B 3.A 【解析】 这是一篇说明文。文章主要解释了为什么热水比冷水更快结冰的原理。 1.细节理解题。根据文章第一句“Warm water freezes more quickly than cold water. Sir Francis Bacon said that almost four hundred years ago.”弗朗西斯·培根在大约四百年前说过,温水比冷水结冰快。由此可知,弗朗西斯•培根发现温水的温度比冷水下降得快。结合选项,故选A。 2.细节理解题。根据文章第五和第六句“He put both in the same low temperature. The warm water froze first.”他把两者都放在相同的低温下。温暖的水先结冰了。由此可知,把一桶温水和另一桶冷水放在相同的低温下,温水会在冷水之前结冰。结合选项,故选B。 3.细节理解题。根据文章最后三句“Some of the warm water changed into vapor. This meant that less of the warm water was left to be frozen. And so the warm water froze faster than the cold water even though it had a greater temperature drop to make.”一些温水变成了水蒸气。这意味着可以冷冻的温水变少了。所以温水比冷水冻结的更快,即使它有更大的温度下降。由此可知,同样寒冷的天气里,温水会先结冰的原因是一些温水变成水蒸气,它的总量比冷水少。结合选项,故选A。
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Dear Sir,

I have to travel every day from Souk Road to the airport. Two buses travel along their route: the number 49 and number 16. But by the time the number 16 bus reaches Souk Road it is always full, so I can’t get on it. I have to wait for the number 49, because sometimes there are empty seats on it.

The timetable says that there are buses from Souk Road to the airport every ten minutes. If this is so, why do I have to wait half an hour for a bus nearly every day?

The regulations (规章) say that if there are empty seats on a bus, the bus must stop at every stop where people are waiting. Why do the half-empty buses go straight past me when I am standing at the bus stop?

The regulations say that no bus may carry more than 40 seated passengers and 20 standing passengers. Yesterday I was the first to get off the bus when it reached the airport. I counted the other passengers as they got off. There were 129 of them.

It is clear that our bus companies break the regulations and think little of their passengers. Can nothing be done to make your service better?

Yours,

Tired passenger

1.The writer has to take Bus No. 49 because ______.

A.it is not always full B.it arrives on time

C.it travels faster D.it has fewer seats on it

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A.20 B.40

C.129 D.60

3.What kind of letter is this passage?

A.It’s a letter of thanks B.It’s a letter of apology

C.It’s a letter of introduction D.It’s a letter of complaint

 

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What’s On?

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7.30pm-1.00am   Free at the Cyclops Theatre

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Come and see Gee Whizz perform. He’s the funniest stand-up comedian on the comedy scene. This joyful show will please everyone, from the youngest to the oldest. Gee Whizz really knows how to make you laugh! Our bar is open from 7.00pm for drinks and snacks(快餐).

Simon’s Workshop

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Fine food with beautiful jazz music; this is a great evening out. Charlotte Stone will perform songs from her new best-selling CD, with James Pickering on the piano. The menu is Italian, with excellent meat and fresh fish, pizzas and pasta(面食). Book early to get a table. Our bar is open all day, and serves cocktails, coffee, beer, and white wine.

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C.to prepare children for their future life

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