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louds are made of tiny drops water. 云是由小水滴構(gòu)成的。 ? 9) Big cities are full of cars. 大城市里都是汽車。 ? The room . ? 2)鳥巢中全都是興奮的觀眾。 ? We . ? ② 他發(fā)現(xiàn)游過這條河很難。 ? 7) More than threefourths of the gas is nitrogen. ? 氣體中四分之三的氣體都是氮氣。 ? 2) The atmosphere surrounds the earth like a blanket. ? 大氣層像毯子一樣包裹著地球。 ? 10) They are used for business and pleasure. 他們是用來商務(wù)和娛樂的。 ? The excited audiences. ? 3)滿滿一袋大米被送到李奶奶家。 ? 8. People who travel to the mountains find it harder to breathe. ? sb. find it + adj. + to do sth. 某人發(fā)現(xiàn)做某事怎么樣 ? 例如: ? I find it very interesting to travel to the forest. ? The boys find it very cool to smoke. ? 【 典型例題 】 ? ① 我們發(fā)現(xiàn)早睡覺有好處。 ? 6) Plants depend on nitrogen to stay alive. 植物依靠氮氣來生存。 ? 3) The atmosphere protects the earth from the sun’s heat. ? 大氣層保護地球免遭太陽的炙烤。 ? 11) Something s