单选题______ from space, our earth, with water covering 70% of its surface, appears as a "blue planet". A. Seeing B. To be seen C. Seen D. Having seen

单选题Are you aware of the danger ______?A) your beingB) you are inC) your being outD) you are through

单选题The lecture was supposed to start at 8:00 a.m. , but the speaker ______ until 8. 30.

单选题The mechanical energy can be changed back into electrical energy by means of a generator．

单选题All the creatures depend on the sun's rays for the light and warmth which ______ us alive.

单选题He takes a walk along the river after supper every day ______ his health. A. for the sake of B. for the profit of C. for the interest of D. because of

单选题It is said that the sudden change in weather ______ many people's health. A．has affected B．has committed C．has effected D．has caused

单选题Very pleased to meet you. We come from China. Some of US have a background working in an academic library. We"d very much like to learn about library operations in the United States. Our specific agenda for this morning is visiting the Circulation Department. We are interested in all the circulation services and functions. Please allow me to start with some questions about your circulation policy. May I ask who is eligible to check out materials from the library?

单选题Peter ______ come with us tonight, but he isn't very sure yet.

单选题The board of the company has decided to expand its operation to include all aspects of the clothing business.

单选题______ for your help, we never have been able to overcome the difficulties. A. Had it not B.If it were not C. Had it not been D. If we had not been

单选题It didn't take a long time ______ we met again.

单选题A pair of shoes ______ by him.

单选题The salesman made an offer, but I didn't accept it and I made a counter-offer which was rejec- ted by him.

单选题What are most Americans usually do if they need advice?

单选题A.8:00B.8:11C.8:07D.8:10

单选题______ I admire George as an artist, I do not like him as a man. A. If only B. Only if C. As much D. Much as

单选题He was ______ the most famous singer.

单选题{{B}}Task 1{{/B}}{{B}}Directions:{{/B}}{{I}} After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 through 40. For each question or statement there are 4 choices marked A, B, C and D. You should make the correct choice and mark the corresponding letter on the Answer Sheet with a single line through the center.{{/I}} The biggest safety threat facing airlines today may not be a terrorist with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have reported well over 100 incidents that could have been caused by electromagnetic interference. The source of this interference remains unconfirmed, but increasingly, experts are pointing the blame at portable electronic devices, such as portable computers, radio and cassette players and mobile telephones. RTCA, an organization which advises the aviation industry, has recommended that all airlines ban such devices from being used during "critical" stages of flight, particularly take-off and landing. Some experts have gone further, calling for a total ban during all flights. Currently, rules on using these devices are left up to individual airlines. And although some airlines prohibit passengers from using such equipment during take-off and landing, most are reluctant to enforce to total ban, given that many passengers want to work during flights. The difficulty is predicting how electromagnetic fields might affect an aircraft's computers. Experts know that portable devices emit radiation which affects those wavelengths which aircrafts use for navigation and communication. But, because they have not been able to reproduce these effects in a laboratory, they have no way of knowing whether the interference might be dangerous or not. The fact that aircrafts may be vulnerable to interference raises the risk that terrorists may use radio systems in order to damage navigation equipment. As worrying, though, is the passenger who can't hear the instructions to turn off his radio because the music's too loud.

单选题We have just dined on the flesh of ______ killed fish.