如图所示是某人的眼球成像示意图,他应该佩戴 ____透镜进行矫正,此透镜对光有 ____作用.
1953-1956年我国出现下图所示农业经济状况的主要原因是( )
— Where does your grandfather live?
— In the countryside. He lives ____ in a big house and often feels____.