当你发现显微镜镜头不清洁时，除去污物的正确方法是（）
A.用擦镜纸擦
B.用纸巾擦
C.用手擦
D.用纱布擦
参考答案：A
The seller should guarantee that the commodities comply ______ the quality, specification and preformance as stipulated in the contract.
A．for
B．in
C．to
D．with
