单选题
单选题Some linguists believe that the ______ age for children learning a foreign language is 5 to 8.
单选题Vitamins are organic compounds necessary in small amounts in the diet for the normal growth and maintenance of life of animals, including man. They do not provide energy, 21 do they construct or build any part of the body. They are needed for 22 foods into energy and body maintenance. There are thirteen or more of them, and if 23 is missing a deficiency disease becomes 24 . Vitamins are, similar because they are made of the same elements--usually carbon, hydrogen, oxygen, and 25 nitrogen. They are different 26 their elements are arranged differently, and each vitamin 27 one or more specific functions in the body. 28 enough vitamins is essential to life, although the body has no nutritional use for 29 vitamins. Many people, 30 , believe in being on the "safe side" and thus take extra vitamins. However, a well-balanced diet will usually meet all the body's vitamin needs.
单选题 中国经济正处在转型的关键阶段。中国已经不能继续沿用高消耗、高投入的旧模式，而必须加大力度调整经济结构和转变经济增长方式。我国将继续推进行政管理(administrative management)、金融部门和物价的改革。服务业将愈发成为我国经济中的重要支柱。作为最大的就业容纳器，服务业为经济转型缓解就业压力。中国经济的升级(upgrading)也将为世界经济提供新的动力。
单选题Serious looking men spoke to one another as if they were ______ of the crowds about them. A. unaware B. neglect C. oblivious D. forgettable
单选题Joanne: Hey, you look concerned.______. Harry.. The final exam. Pm not fully prepared yet.
单选题Perhaps more than anything else, it was {{U}}onerous{{/U}} taxes that led to the Peasants' Revolt in England in 1381.
单选题His trick convinced none but the most ______.
单选题The moon may be considered a world that is complete in itself yet utterly dead, a sterile, mountainous waste on which (during the day) the sun (blazes down) with great heat, but on which during the night the cold is so intense that it (far) surpasses anything ever (experiencing) on the earth.
单选题Jackson is not______as you imagine.
单选题She's gone already? And I am only ______ minutes late!
单选题We never dared to ask him a question ______?
单选题Economics, several courses of which I have taken thus far, ______ to be difficult but useful for almost all students. ( )
单选题The word "target" in the last sentence of the first paragraph can best be replaced by ______.
单选题______ could animals be hunted in this are
单选题Research shows that many voters who haven't yet made up their minds are ______towards the Democrats.
单选题The police have offered a large ______ for information leading to the robber's arrest.
单选题Everyone in the room remained ______.
单选题Convenience foods which are already prepared for cooking are _____ in grocery stores.
单选题By comparing past problems with present ones, the author draws attention to the