The doctor ____ my eyes carefully and told me that there was nothing serious with them. [ ]

A. saw

B. examined

C. checked

D. controlled

下列各项中，不是反映生物对环境影响的是（  ）

A．夹竹桃能够吸收二氧化硫等有毒气体，净化空气

B．大树底下好乘凉

C．地衣等植物能够分泌酸性物质，对岩石有腐蚀作用

D．月球引力等综合作用导致潮汐发生