连词成句。

1. go,  on,  I,  school,  foot,  to   

                                                                               .  

2. do,  to,  park,  how,  the,  you,  go   

                                                                               ?  

3. can,  No.15,  go,  bus,  you,  school,  to,  the,  by   

                                                                               .  

4. near,  is,  home,  the,  my,  office,  post    

                                                                               . 

5. go,  stop,  can,  to,  bus,  foot,  we,  on,  the

                                                                               .

( )是保持水地资源的主要因素，往往是荒漠与森林的过渡带。

A．草原资源
B．森林资源
C．水资源
D．矿产资源