题目

完成句子。根据所给提示,完成句子。每空一词,含缩略词。 1. Tony used to be short. (改为否定句)    Tony _____ _____to be short. 2. They will take my position in three days’ time .(对划线部分提问)     _____ _____will they take your position? 3.We can’t decide when we should go to Yunnan.(改为同义句)   We cant decide ______ ______ go to Yunnan. 4. 老师总是鼓励我们多参加各种活动。(完成译句)    The teacher always _______ us to join all ______of activities often.18.将一方形冰块(体积为V冰)放于盛有水的圆柱杯中,再将一方形石块(体积为V石)放于冰块上,静止时水面正好和石、冰交界共面(如图),已知水、冰、石密度之比为10:9:30,则V冰:V石=30:1.当冰块全部融化成水,取出石块,此时的水面与原来相比将降低(选填“升高”、“降低”或“不变”).
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