30. The Sports Medicine Programs of the Olympic Training Center, a complex where final try outs are held for athletes representing the US in the Olympics, is geared toward enhancing athletes' performance and toward their preparation for international competition. A.) is geared toward enhancing athletes' performance and toward their preparation B.) is geared to enhance the performance of athletes and to prepare them
C.) are geared to enhance athletes performance and their preparation
D.) are geared toward the enhancement of athletes' performance and toward preparing them
E.) are geared toward enhancing the performance of athletes and preparing them
A: is 应该改复数，toward 后面不平行
B: is 应该改复数
C: enhance their preparation 不合逻辑
D: and前后不平行
E: correct
注意：句意上判断是哪种平行 ================================================
我想知道为什么用are,而不是is, The Sports Medicine Programs of the Olympic Training Center 应该说的是一个大的项目吧？否则为什么要大写呢？ 另外，enhance toword doing与enhance to do是否都可以使用，还是哪个更加好。。。 | 
