题目

用所给动词的适当形式填空。 1.I’m hungry now.I ________ (not eat)my breakfast. 2.It’s useful for people ________ (take)care of the environment. 3.When I passed his room I heard him ________ (sing)an English song. 4.I ________ (watch)TV at 7:00 yesterday evening. 5.The book ________ (seem)very interesting.The boy likes it very much. 6.I’m glad ________ (see)you again. 7.Thank you for ________ (tell)me about what you like. 8.The USA is a very big country ________ (visit). 9.Come on,better get ________(go某摩托车生产企业,上年度生产摩托车的投入成本为1万元/辆,出厂价为1.2万元/辆,年销售量为1000辆.本年度为适应市场需求,计划提高产品档次,适度增加投入成本.若每辆车投入成本增加的比例为x(0<x<1),则出厂价相应的提高比例为0.75x,同时预计年销售量增加的比例为0.6x.已知年利润=(出厂价-投入成本)×年销售量.(1)写出本年度预计的年利润y与投入成本增加的比例x的关系式;(2)为使本年度的年利润比上年有所增加,问投入成本增加的比例x应在什么范围内?
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