影响乳畜业生产的最重要因素是 (       )

李明：高个子，戴眼镜

航班号：CA985

到达：8月6日上午11:30

注意：1).词数100左右；

2).可适当增加细节，以使行文连贯；

3).开头和结尾已给出，不计入总词数。

Dear Peter,

    How are you doing?

    Looking forward to your reply.

                                                                                                                                                                 Yours,

                                                                                                                                                                    Li Hua