用于寄生虫检验的粪便样品，应选自（）的粪便或直接从内采得。
A.新排出、结肠
B.新排出、直肠
C.无污染、直肠
D.无污染、结肠
参考答案：B
_____, we need to improve the equipment in our factory. [ ]
A. As it is
B. As it was
C. As it were
D. As it will be
按公式计算，5个月婴儿正常体重是（）
A.5kg
B.6.5kg
C.6.8kg
D.7kg
E.7.2kg
