单选题According to those who support the liberalization of Europe's energy markets, energy supply monopoly is unlikely on the grounds that

单选题Acid rain leads to fish mortality. Many species of fish cannot survive in aquatic environments where the pH is below 5.0. If the water is too acid, the gill systems of many kinds of fish can be damaged. 1 , the acid alters the blood chemistry of all fish. As a result, the fish population in an acidic environment decreases 2 becomes extinct. Approximately 20 percent of the lakes in Scandinavia are without fish. Moreover, in Nova Scotia the 3 salmon industry may be threatened by the decrease of salmon in rivers and streams. The impact is also 4 in the waters of Ontario and Quebec, where fish populations are (25) the decline. What potential remedies exist for the acid rain 5 ? The experts disagree. Some say new environmental laws should be 6 to control the emission of pollutants in the atmosphere. Some say that if we had known how serious acid rain was, we would have planned 7 to prevent it. 8 , all agree that if the consumption of fossil fuel were reduced, we would have less of a problem. Another 9 is that special scrubbers could be installed in smokestacks to remove a good 10 of the pollutants before they get into the atmosphere. Other ideas even include breeding more 11 fish. And research suggests that spreading lime into lakes may be effective in 12 acidity. In conclusion, it is clear that if we truly want to reduce the impact of acid rain, a 13 of remedies and international cooperation must be explored. It is a sad fact that acid rain probably could have been avoided if we 14 what we know now.

单选题The combination of lenses in a compound microscope makes possible greater {{U}}amplification{{/U}} than can be achieved with a single lens.

单选题President, as well as volunteer workers, ______ the newly-built stadium． A．is cleaning B．are cleaning C．were cleaning D．have cleaned

单选题He is a hypocrite, a liar, a thief ______, he is the greatest devil I ever know. A．as a consequence B．as a rule C．as a matter of fact D．as a matter of routine

单选题We made plans for a visit, but______difficulties with car prevented it.

单选题A child learning to talk does not learn by being corrected all the time; if corrected too much, he will stop talking. He notices a thousand times a day the difference between the language he uses and the language those around him use. Bit by bit, he makes the necessary changes to make his language as other people"s.

单选题Woman: What present should we get for Betty's birthday?Man: She's poor at math, don't you remember?Question: What does the man imply?

单选题You can see the whole of Chinese history at______ in April in Anhui Museum.

单选题Fond of singing as she is, she is ______ a good singer by profession. A. everything but B. something but C. nothing but D. anything but

单选题The Nobel Prizes are awards that are given each year for special things that people or groups ofpeople have achieved. They are awarded in six 21__________ : physics, chemistry, medicine, literature,pe

单选题 Listen to the following passage. Altogether the passage will be read to you four times. During the first reading, which will be done at normal speed, listen and try to understand the meaning. For the second and third readings, the passage will be read sentence by sentence, or phrase by phrase, with intervals' of 15 seconds. The last reading will be done at normal speed again and during this time you should check your work. You will then be given ONE minute to check through your work once more.. Raw Milk Some milk drinkers like what they call 'real milk', / also known as raw milk.

单选题(Only if) (ten more) students register this afternoon (will another) pronunciation section (be opening).

单选题I grew more and more aware of Iago's ______ purpose as I watched him plant the seeds of suspicion in Othello's mind.

单选题The president is often awakened by a noisy crowd which assembles on the White House.

单选题During the summer session there will be a revised schedule of services for the university community. Specific changes for intercampus bus services, summer hours for the cafeteria, the infirmary (校医院) and recreational and athletic facilities will be posted on the bulletin board outside of the cafeteria. Weekly movie and concert schedules which are in the process of being arranged will be posted each Wednesday outside of the cafeteria. Intercampus buses will leave the main hall every hour on the half hour and make all of the regular stops on their route around campus. The cafeteria will serve breakfast, lunch, and early dinner from 7 a.m. to 7 p. m. during the week and from noon to 7 p.m. on weekends. The library will maintain regular hours during the week, but shorter hours on Saturdays and Sundays. The weekend hours are from noon to 7 p. m. All students who want to use the library borrowing services and recreational athletic, and entertainment facilities must have a valid summer identification card. This announcement will also appear in the next issue of the student newspaper.

单选题All______is an English-Chinese dictionary.