题干
—Scientists all over the world are ______ new drugs to treat cancer．
—It will help many sick people．
A：increasing
B：rising
C：developing
答案(点此获取答案解析）
C
—Scientists all over the world are ______ new drugs to treat cancer．
—It will help many sick people．
A：increasing
B：rising
C：developing
＝m 
＝4 
，其中m、n为正整数，求m