单选题When light enters a camera, it strikes the film, whose surface reacts to the light.

单选题The villagers were ______ by the news of the criminal's release from the prison.

单选题Once a proposal goes into its place, it's not likely to {{U}}reverse{{/U}} it.

单选题The recent conference on the effective use of the seas and oceans was another attempt resolving major differences among countries with conflicting interests.

单选题When she returned {{U}}back by{{/U}} abroad, she told us all about her experience as an illegal immigrant.

单选题The Underground Railroad was an {{U}}elaborate{{/U}} network of safe houses organized to help slaves from bondage before the Civil War. A. complicated B. illegal C. secret D. isolated

单选题Being just a ______ schedule, it still requires more improvement.

单选题The engineers are going through with their highway project, in spite that the expenses have risen.

单选题Construction is expanding all over China, no doubt many materials will be needed at a very big amount in future. A. China, no doubt many materials will be needed for a very big amount B. China, no doubt many materials will be needed in a very big amount C. China; no doubt many materials will be needed in large amounts D. China; no doubt many materials will be needed for large amounts

单选题Many sat at the table, looked at the plate and ______ her lips.

单选题Learning the English language involving a lot of skills, Sandra puts much emphasis on learning the sentence patterns other than the vocabulary.

单选题In 1870, the United States Bureau of the Census officially distinguished the nation"s urban population from its rural population.

单选题Few pleasures call equal such of a cook drink on a hot day. A. this B. all this C. that D. all that

单选题Informal mechanisms of social control include the following EXCEPT ______.

单选题This leaves us with the challenge of finding some politically practicable way to reduce greenhouse gas emissions. But it is an awkward truth that when most U.S. senators were asked informally in 2000 if they would support the Kyoto Protocol should President George W. Bush send it to the Senate for ratification , the overwhelming majority, Democrats as well as Republicans, said they could not. The reason for the liberals"surprising reply is clear. Many studies, not all by conservatives, suggest that full compliance with the terms of the Kyoto Protocol would likely lead to a deep American recession. For those willing to Fun this risk, sober reflection on the consequences of the economic collapse of 1929 and the subsequent worldwide depression with all its political and ultimately military consequences is certainly in order. That said, what can be done, in particular by our own country? Independent of the issues raised by the Kyoto Protocol, and given the weight of evidence that the problem of global warming is serious and fraught with dire consequences, failure to do anything at all and instead to promote "business as usual" is downright criminal. Yet the Bush administration has given no more than lip service to the problem, though that could be changing. It is one thing to weigh alternatives and implement compromises that reflect the complexity of the problem; it is quite another thing to do nothing, especially if doing nothing is just a way of securing support from certain industries that worsen the problem. There are, after all, things that can be done. Reopening a serious international dialogue, and not just saying a few good words, would be a useful if inadequate start. Not every problem must be solved before the weight of evidence becomes so compelling that certain initial steps become almost mandatory. We already know how to make more fuel-efficient automobiles, yet no national policy has surfaced to accomplish this. The scientific and engineering communities are the ones best suited to identify the scientific research that is still needed and the technical projects that show the greatest promise. These issues should be decided by them and not the politicians. Once solutions look promising, as a few already do, industry will be all too ready to jump in, for at that stage there is money to be made. And only a fool would underestimate human ingenuity when given a proper incentive, or the strength of American industry once the boiler is lit under it.

单选题I knew nothing of the motives behind his recent move, and {{U}}I don't know either the person to{{/U}} put him up to the action.

单选题We realized that John was still young and impressionable, but were nevertheless surprised at his ______.

单选题Evidence collected by the spacecraft on Mars shows some present volcanic action, though the volcanoes are believed to be dormant if not {{U}}dead{{/U}}.

单选题I have watched these people all come and go, alternately being pestered by the desire to obtain a fair price for my possessions and by the desire to make an end of it all.

单选题Construction of the gigantic office building in this city was for years intermittent .