题目内容
—Everyone except the twins ____________ Beijing.
—Oh, their mother is ill, so they have to look after her.
A. have been to. B. have gone to.
C. has been to. D. has gone to.
D
【解析】
试题分析：句意：--除了这对双胞胎，每个人都已经去北京了。-- 哦，他们的母亲生病了，因此，他们不得不照顾她。分析：except为主语伴随语，真正的主语是everyone; 提到的人，不在说话地，因此运用现在完成时，has gone to.故选 D
考点：考查现在完成时。
寒假乐园北京教育出版社系列答案New Energy in the Twenty-first Century Energy from the wind.
All over the world, people use the power of the wind. It is a clean source of energy, and there is lots of it. But if the wind does not blow, there is no wind energy.
Energy from the water
When water moves from a high place to a lower place it has the power to make electricity. In Britain, waterpower produces enough energy to power a town with 40000 people. Waterpower gives energy without pollution, but people have to build dams(大坝) to use this kind of power, and building dams is very expensive.
Energy from the earth
There is heat in the rocks under the earth. Scientists use the heat to make geothermal(地热的) San Francisco gets half of the energy it needs from geothermal power. This kind of energy is cheap, but it is only possible in a few places in the world.
Energy from the sun
Solar panels(镶板) on the roofs of houses and buildings can turn energy from the sun into electricity. These panels can create enough energy to heat the whole house during winter. Solar power is clean and plentiful, but when the weather is bad, it can’t produce power.
阅读上面信息，完成下列表格。
| Advantages | Disadvantages |
Wind power | Clean energy. There is a lot of it. | 1.__________________________ |
Waterpower | 2._________________ | It is expensive. |
Geothermal Power | 3.___________________ | It is only possible in a few places in the world. |
Solar power | Clean and plentiful. | 4.___________________________ |
Jack’s brother bought a magazine called Choice. It introduces to its readers information about all kinds of products like cameras, computers, cars, etc. This information helps them make the best choice when they buy something.
Jack borrowed his brother’s magazine when he needed a new computer. “I’ll read about all the different computers,” he said, “And I’ll choose the best one.”
ThinkPad G450M-T4300: This computer comes with lots of good software. However it does not have much memory and is rather slow. At $3,600, it’s not very good value for money.
HP CQ40-506AX: This is the most expensive computer we tasted. However it is also the most
reliable(值得信赖的). It is very fast and has lots of memory. Though it’s 600 dollars more expensive than ThinkPad G450M-T4300, it is worth the extra money if you can afford it.
The Acer A175-78: At only $2,600, this is the cheapest computer we tasted. It has plenty of memory and is quite fast. However, it “crashed” twice while we were testing it and we cannot recommend(推荐) it for reliability.
Jack choose HP CQ40-506AX. “I know it’s expensive, brother,” he said. “But it will last me a long time and do everything I want it to do.”
Types | Advantage | Disadvantage | 1. __ ___ |
ThinkPad G450M-T4300: | Good software | Doesn’t have much memory and is rather slow. | $3,600 |
HP CQ40-506AX | 2.________ | The most expensive | 3. |
The Acer A175-78 | Plenty of memory and quite fast | 4._______ | $2,600 |