Many entomologists say that campaigns to eradicate the fire ant in the United States have failed because the chemicals that were used were effective only in wiping out the ant's natural enemies, which made it easier for them to spread.
问题:The Sports Medicine Programs of the Olympic Training Center, a complex where final tryouts are held for athletes representing the United States 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
答案是E, 我选C, 语法笔记里说C错是因为to enhance和their preparation不平行,我想问为什么不能理解为athletes' performance 和their preparation平行呢?
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