曲面z=y+lnx／z在点（1，1，1）处的法线方程是：（）

A.（x-1）／1=（y-1）／1=（z-1）／-1

B.（x-1）／1=（y-1）／1=（z-1）／-2

C.（x-1）／1=（y-1）／-1=（z-1）／-2

D.x+y-z=1

根据汉语意思，完成下列句子。

1. How far is it from your home to school?

                                                               (大约四公里).

2. How long does it take you to walk to school?

                                                             (二十分钟).

3. How do you go out for travelling?

                                                            (坐火车).

4. Where is the Peace Park?

                                                          (离学校十五英里).

5. Do all the students in America take the school bus to school?

    No, in America,                          (并非所有学生乘校车上学).