Mr Green asked the children to _____ the words in the dictionary.  [ ]

A. look at

B. look up

C. look for

D. look after

可用作尿路感染筛选试验的检查是（）

A.尿图片镜检细菌

B.尿培养及菌落计数

C.血常规

D.尿抗体包裹细菌检查

E.尿亚硝酸盐试验