It's good ________ old people cross the road.
A:helping
B:to help
C:helps
某实验室仅有如下仪器或用品:烧杯、铁架台、铁圈、三脚架、漏斗、分液漏斗、石棉网、酒精灯、玻璃棒、量筒、蒸发皿、圆底烧瓶、火柴。从缺乏仪器或用品的角度看,不能进行的实验项目是( )
I am going to make supper now. _________ there any mutton and tomatoes in the fridge?
生活离不开化学,下列生活习惯或做法合理的是( )