单选题Customer service stands out as the area where WestNet falls most behind, with 43.8 percent of its users in the survey saying "its security does not come______".

单选题Purchasing the new production line will be a ______ deal for the company.A. profitableB. tremendousC. forcefulD. favorite

单选题I hope that you'll be more careful in typing the letter. Don't______anything. A. lack B. withdraw C. omit D. leak

单选题Coconut椰子is an unusual food for many reasons.It is one of the largest edible seeds produced by any plant.Its unusual contents also make it unique in the seed world—it consists of both “meat“ and “wate

单选题The writer is in favor of the view that man' s intelligence is given to him ______ ．

单选题The nation-wide economic slowdown worsened the ______ between employer and employee.

单选题Patrick was ______ leader of the baseball team of the college.

单选题The author skillfully fuses these fragments into a ______ whole.

单选题The professor spoke very clearly to make himself ______.

单选题In the early 20th century, at the Uadvent/U of the telephone, it was considered a superfluous instrument which would never be of practical use in the average household.

单选题I must have hung ______ for ten minutes before the telephone operator put me through.

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.