单选题He began by showing us where the country was and went on ______ us about its climate.

单选题“Why didn't you use that printer?” “Because it wasn't ________ to fit it.”

单选题Climate change will greatly _______ wheat and rice production if nations don't take steps now.

单选题The second paragraph mainly tells us that ______ .

单选题Many a delegate was in favor of his proposal that a special committee ______ to investigate the incident.

单选题Scientists in India have invented a new way to produce electricity. Their invention does not get its power from oil, coal or other fuels. It produces electricity with the power of animals. India has about eighty million bullocks (小牛). They do all kinds of jobs. They work in the fields. They pull vehicles through the streets. They carry water containers. Indian energy officials have been seeking ways to use less imported oil to provide energy. Scientists at the National Institute for Industrial Engineering in Bombay (孟买) wondered whether the millions of bullocks could help. Many villages in India lack electricity, but they have many bullocks. And often the animals are not working. One job done by bullocks is to pump water out of the well. The animals do this by walking around and around in a circle. As they walk, they turn a heavy stick that makes the pump move. This simple technology is centuries old. Scientists thought that the same technology could be used to produce electricity. Bullocks walk in a circle only two or three times a minute. This is much too slow to produce electricity, but it can create enough power to turn a series of gears (齿轮). A large gear sits next to a smaller gear. As the large gear turns, it causes the smaller gear to turn. That gear turns an even smaller one. Each gear moves faster because it is a little smaller. The smallest gear may turn extremely fast. Clocks operate with gears. So do cars and so does the device invented by the Indian scientists to produce electricity. According to the officials in the United Nations, the idea is being tested at several places in India. The device is easy to operate and repair. And it can be moved easily. It costs about three hundred and seven dollars now to make such a device, but production of large numbers of them could cut the cost of each to about two hundred dollars.

单选题He finished ______ school at the age of eighteen.A. aB. theC. thisD. /

单选题After the war, a new school building was put up______there hadn't once been a theater.

单选题There at the door stood a girl about the same height ______.

单选题Darkness doesn't trouble eats, for they can see ______.

单选题(Nothing) (but) two chairs (are) (in) the room.A. NothingB. butC. areD. in

单选题One car went too fast and ______ missed hitting another car.

单选题Many players who had been highly thought of have ______ from the tennis scene.

单选题__________ impossible to make a living in real estate, Nancy added insurance as a side line.

单选题You ______ such a long essay. Mr. Smith only asked for 300 words, and you have written 900. A. needn't have written B. needn't write C. didn't need write D. didn't need to write

单选题Email as well as mobile telephones are becoming more and more popular in daily communication. 　　　　　　　　A　　　　　　　　　　B　　　　　　　C　　　　　　 D

单选题Mark needs to travel _______ with his varied business interests.