18.______ to the mountain towns is often difficult because of bad roads.
A. Aversion B. Orison C. Incentive D. Access
<aversion>
aversion 厌恶，嫌恶，讨厌的
</aversion>
<orison>
orison 祈祷
</orison>
<incentive>
incentive 刺激，奖励 (跟金钱有关)
</incentive>
