从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21．_____Olympic Marathon is 26 miles and 385 yards，_____distance from Marathon to Athens.
A．The; the B．/；a C．An；a D．/；the
22．——It is said that the number of Chinese characters you can type on your mobile phone is______ the total number of Chinese characters．
——I know．That is because the character input systems are made by foreign cell phone producers.
A．25 percent much than B．25 percent as less as
C．less than 25 percent D．25 percent as much
