单选题Leave me alone; mind your own ______.

单选题The island's chief was its beauty.

单选题It was not until an hour later that we heard ______ what had happened.

单选题It's time ______ about the traffic problem downtown.

单选题There (are) not many people in this city (which) (own) the houses they (live in).A. areB. whichC. ownD. live in

单选题I was so familiar with her that I recognized her voice ______ I picked up the phone.

单选题If you don't put the cheese in the refrigerator, it may ______.

单选题Salesman: Good morning, I wonder if you could spare a few minutes of your time. Mrs. Davis: ______. Are you selling something?

单选题Katherine: Linda! I haven't seen you for ages. How are you? Linda: Oh, just so so. Don't you know? Frank and I got divorced two years ago. Katherine: ______

单选题Tourism has become a very big 1 . For Spain, Italy and Greece it is the largest 2 of foreign exchange, and even for Britain, it is the fourth. Faced with this hug new income, no government can afford to look 3 on the business; questions of hotel bath rooms, beach umbrellas and ice-cream sales are now discussed by ministers of tourism with solemn expertise. Before the Second World War the tourist industry was widely regarded as being unmanly and stupid. But tourism has become a new industry, as trade business used 4 ; in Spain, Italy, Greece and much of Eastern Europe, new road systems have opened up in the country, first to tourists, and then to industry and locals. Much of tourism is a nationalized industry, a 5 part of national planning. In a place west of Marseilles, the French government is killing mosquitoes and building six big vacation places to 6 nearly a million tourists. In Eastern Europe, a whole new seaside 7 has sprung up 8 the last few years: the governments have greatly 9 when tourists from the West 10 from half a million four years ago to nearly two million last year.

单选题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 (航空) industry, has recommended that all airlines ban(禁止)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. (76) 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 a total ban, given that many passengers want to work during flights. The difficulty is predicting how electromagnetic riel& might affect all aircraft's computers. (77)Experts know that portable devices emit radiation which affects those wavelengths which aircraft 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 aircraft may be vulnerable(易受损的)to interference raises the risk that terrorists may use radio systems in order to damage navigation equipment. (78) 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As we know, physics ______ the science of energy.

单选题Every human being, no matter what he is doing, ______ body heat.

单选题Many statistics related to the economy are published ______

单选题It was hard for him to learn English in a family, in which ________ of the parents spoke the language.

单选题It may not ______ high income, but it can make them feel proud.

单选题The snow fell ______ fast that our footsteps were covered up in a few minutes.

单选题The team ______of scientists and experts in different lines of work. A. insisted B. consisted C. persisted D. composed

单选题—Why did you go back to the shop? —I left my friend ______ there.