On October 15, 2003 China _________ its second lunar orbiter Chang'e 2．

1. A.
   set out
2. B.
   set off
3. C.
   sent up
4. D.
   sent out

On October 15, 2003 China　　 its second lunar orbiter Chang'e 2.

A. set out　 　　　 B. set off 　　　　 C. sent up 　　　　 D. sent out