题目内容
I ______my homework in my study the whole morning. I went nowhere.
A.do B.did C.was doing D.would do
C
【解析】
试题分析：句意：在我学习的整个早上我一直在做作业，我任何地方都没去。过去进行时表示过去某一时间正在进行的动作，整个早上我一直在做作业，故选D。
考点：考查动词进行时。
名校课堂系列答案
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.___________________________ |