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>