小题1:Trees can get light from in the daytime. A．C0 2 B．O 2 C．the sun D．the moon 小题2:Chlorophyll is in . A．sunlight B．soil C．air D．leaves 小题3:We can get more O­ 2 by . A．planting more trees B．cutting trees down C．making the water in soil(土壤) polluted D．making more CO 2 小题4:CO 2 from air and can produce food  for trees with the help of chlorophyll and sunlight. A．water in the sea B．water from soil C．water in the river D．O 2 into air 小题5:The picture tells us . A．how trees let O 2 go into air in the sunlight B．how trees let CO 2 go into air in the sunlight C．the sunlight isn't important to trees at all D．trees can take in O 2 and let out CO 2