18.______ to the mountain towns is often difficult because of bad roads.

A. AversionB. Orison

C. IncentiveD. Access


(点击右边三个点，可调整速度，电脑上可下载)

aversion厌恶，嫌恶，讨厌的

orison祈祷

incentive刺激，奖励 (跟金钱有关)