In ________ North China,________ rain is very scarce,but in ________ south of China,there is ________ heavy rain now and then．

1. A.
   \;the;the;a
2. B.
   \;the;\;\
3. C.
   the;a;a;a
4. D.
   \;the;the;\

In       North China,       rain is very scarce, but in       south of China, there is       heavy rain now and then.

       A．不填；不填；the;a                              B．不填；the;不填；不填

       C．the;a;a;a                                              D．不填；the;the;不填