q101018013

同意楼上的！这里是一个陷阱啦~
注意原文说的是：
.Only a reduction of 10 percent in the number of scheduled flights using Greentown’s airport will allow the delays that are so common there to be avoided. Hevelia airstrip, 40 miles away, would, if upgraded and expanded, be an attractive alternative for fully 20 percent of the passengers using Greentown airport.
一个是the number of scheduled flights，后面则是the passengers，是gmat在偷换概念。所以我们读题一定要认真，一不小心就掉进出题老头们挖的陷阱了