A:能帮助植物传播花粉、果实、种子
B:能促进生态系统的物质循环
C:能促进生态系统的能量流动
D:能作为生态系统中的生产者
—What should we do for the disabled children in the Children's Home?—You're supposed to________ a study group to help them.
—C-A-S-E.
It seems that the old man for something over there.