Do you often ______________ football after school? [ ]
A. playing
B. plays
C. play
答案:C
智力主要指______、______、________、________。
生物必须适应环境才能生存下去,生物在 (8) 环境的同时,也影响和改变着环境。水稻与杂草的关系是 (9) 关系。