根据有关资料报道,中国物流成本约占GDP的比重是( )%。A.5 B.10 C.2 发布时间:2017-06-18 21:35 │ 来源:www.tikuol.com 题型:单项选择题 问题: 根据有关资料报道,中国物流成本约占GDP的比重是( )%。A.5B.10C.20D.40
题型:单项选择题 Directions: Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need. A. poisoned B. destruction C. survived D. increased E. especiallyF. chemicals G. concern H. decline I. occasionally J. sensitive More recent research has shown that many kinds of amphibians (两栖动物) are declining or have become extinct. Amphibians are animals, such as frogs, that live partly in water and partly on land. And they have been around for over 350 million years. They have 1 three mass extinctions, including the extinction of the dinosaurs. Why are they dying out now? The most serious aspect of amphibian loss, however, goes beyond the amphibians themselves. Scientists are beginning to think about what amphibian 2 means for the planet as a whole. If the earthis becoming unlivable for amphibians, is it also becoming unlivable for other kinds of animals and humanbeings as well?Scientists now believe that amphibian decline is due to several environmental factors. One of these factorsis the 3 of habitat, the natural area where an animal lives. Amphibians are very 4 to changes in theirhabitat. If they cannot find the right conditions, they will not lay their eggs. These days, as wild areas are covered with houses, roads, farms, or factories, many kinds of amphibians are no longer laying eggs. There are a number of other factors in amphibian decline. Pollution is one of them. In many industrialareas, air pollution has 5 the rain, which then falls on ponds and kills the frogs that live there. In farmingareas, the heavy use of 6 on crops has also killed off amphibians. Another factor is that air pollution hasled to 7 levels of ultraviolet (UV) light. This endangers amphibians, which seem to be 8 sensitive to UV light. All these reasons for the disappearance of amphibians are also good reasons for more general 9 . These factors affect human beings, too. 查看答案
题型:单项选择题 【10福建宁德】8.下列反应属于置换反应的是①Zn+H2SO4=ZnSO4+H2↑ ②NaOH+HCl=NaCl+H2O③Cu+2AgNO3=2Ag+Cu(NO3)2 ④CO+CuOCu+CO2⑤2H2O2H2↑+O2↑A.①②B.①③C.③④D.④⑤ 查看答案