六千七百四十五写作( )
6745,392
—How much _____ the T-shirt and bag?
— _____ 46 dollars.[ ]
A. is; It's
B. is; They is
C. are; They are
D. are; They do
鉴别下列各组生活中的物质,括号中选用的试剂或方法,不合理的是( )
A.白酒和白醋(闻气味)
B.白糖和食盐(尝味道)
C.糖和味精(加水溶解)
D.铁和铜(观察颜色)