题目

So far this year we________ a fall in house prices by between 5 percent and 10 percent. A . saw B . see C . had seen D . have seen 答案:D下列营养物质中,能为人体生命活动提供能量的是(  )①糖类   ②脂肪   ③蛋白质   ④水    ⑤无机盐A.①③⑤      B.①②④      C.①②③      D.①②⑤ 
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