下列不属于旧机电产品的是 ( )
A．旧钢轨
B．旧打印机
C．旧电饭锅
D．旧车船
参考答案：A
Never before _____seen anybody who can play tennis as well as Robert.
A．had she
B．she had
C．has she
D．she has
矿工被困井下，下列物质中对其维持生命很重要，但又不能提供能量的是（ ）
A．水
B．糖类
C．脂肪
D．蛋白质
