1.It is said that the number of Chinese characters users can type on their mobile phone is ( B ) the total number of Chi

1.It is said that the number of Chinese characters users can type on their mobile phone is ( B ) the total number of Chinese characters .The reason is that the character input systems are made by foreign cellphone producers.
A 25 percent as less as B less than 25 percent
C 25 percent much than D 25 percent as much
(翻译一下这句话.为什么B可以?不是说25 percent +of+the+名词吗?C又为什么不行?)
2.Where did you come across our english teacher?
----It was in the shop ( A ) I bought moon cakes.
A that B where
(我知道A是强调句.但是我记得老师以前说过where也可以在强调句里面用,而且是强调地点的时候用?)
3.It is only by practising English for several hours every day( C )be able to use it freely.
A will you B may you C that you will D when you must
(为什么A不行?选C是强调句,但是不是有only 修饰状语吗?为什么是that you will而不是that will you?）