My brother usually gets up at 6: 10, and then he cleans _______ room.
A:he
B:his
C:him
D:himself
如图:鹰吃蛇,蛇吃鼠……,请写出这条食物链:____ ,如果人们大量捕杀狐狸,则在短时间内兔的数量会____ ,草的数量会____ .(最后两空选填:减少或增多)
能用发霉、变质的残羹剩饭或饲料喂养家禽家畜吗?为什么?