2.像孩子那样对待我

　treat me as if I were a child

1.试图帮助　 try to help

60.一件事，另一件事 one thing, the other

Unit 17 some phrases

59.补上　 make up

58.一点一点地　 point by point

57.列出相似与区别

list similarities and differences

56.利用野牛　 make use of the bison

55.以……结束　 end up with

54.放弃　 give up

53.整个平原的野生动物链

the whole wildlife chain of the plains