I.单项选择。
( ) 1. (2010河北).Everyone ______ I come from Sichuan. Actually, I come from Shandong.
A. find B. think C. finds D. thinks
( ) 2.（2010湖北黄冈）-David has been away for more than 25 days.
-I miss him very much. You know, 25 days ____short.
A. is B. isn't C. are D. aren't
( ) 3.（2010湖北十堰）Climbing hills ______of great help to our health.
A. was B. were C. is D. are
