单选题At the Kyoto conference on global warming in December 1997, it became abundantly clear how complex it has become to work out international agreements relating to the environment because of economic concerns unique to each country. It is no longer (21) to try to forbid certain activities or to reduce (22) of certain substances. The global challenges of the inter-link between the environment and development increasingly (23) us to the core of the economic life of states. During the late 1980s we were able, through international agreements, to make deep (24) in emissions (25) the ozone layer. These reductions were made possible (26) the harmful substances could be replaced (27) negative effects on employment and the economies of states. Although the threat of global warming has been known to world for decades, we know that the effects of measures, (28) harsh measures taken in some countries, would be nullified if (29) countries do not control their emissions. Important and populous low- or medium-income countries are not (30) willing to undertake legal commitments about their energy uses. We must, (31) find a solution to the threat of global warming early in the 21st century. Such a (32) would require a degree of shared vision and common responsibilities new to humanity. Success lies in the force of imaginations, in imagining what (33) if we failed to act. Although many living in cold regions would welcome the global-warming effect of a warmer summer, (34) would cheer arrival of the (35) tropical diseases, especially where there has been none.

单选题Most people ______.

单选题(Under no circumstances) (he would) (give up) his (writing).

单选题I ______ rather solve the problems in my farm myself than seek the help of other people. A. should B. shall C. would D. will

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单选题Of the three speech acts, linguists are most interested in the ______ because this kind of speech act is identical with the speaker"s intention.

单选题The ratio of the work done by machine______the work done on it is called the efficiency of the machine.

单选题Since most, if not all learning occurs through ______, relating one observation to another, it would be strange indeed if the study of other cultures did not also illuminate the study of our town. A. assumptions B. experiments C. comparisons D. repetitions

单选题EverymorningIgo______schoolbybike.A.theB.forC.toD.

单选题Of the thousands of known volcanoes in the world, the______majority are inactive.

单选题A full-sized tripod is far too ______ to carry around. I find this pocket-sized one is much handier.

单选题Parts of Shakespeare's life continue to remain a mystery because ______. A. writers had no claim over their works B. the Great London Fire burned important documents C. people are not interested D. researchers do not have the expertise to find the facts

单选题Ever since the rise of industrialism, education has been______towards producing workers.

单选题Where would Miran probably go if he could leave the airport?

单选题He is honest. His actions are always ______ his words.

单选题Inthatcountry,studentswillbe_____admittancetotheirclassroomiftheyarenotproperlydressed.