China's average salary level is expected to increase----9.8％in the first half of 2012.
问题描述：
China's average salary level is expected to increase----9.8％in the first half of 2012.
A,to
B,by
答
increase to （从 ...) 增加到 ...（总数量）
increase by 增加（的净值/净百分数）
比如
My salary will increase from $1000 to $1100 我的薪金将从 $1000 增加到 $1100.
My current salary is $1000.It will will increase by $100 to $1100 我现在的薪金是 $1000.它将增加 $100 到 $1100
My current salary is $1000.It will will increase by 10% to $1100 我现在的薪金是 $1000.它将增加 10% （即 $100) 到 $1100
所以要填 B .