地球环境中最活跃的圈层是（ ）
A：大气圈
B：生物圈
C：水圈
D：岩石圈
“东方破晓映曙光，南湖龙腾涌激浪．志逐大同指新路，旗摰马列引国航．”这几句诗是为了纪念（ ）
Large amounts of food ______ wasted in our school everyday, but the poor in many countries ______ no access to drinking water.
