19. on turning the corner, we saw the road _______ steeply.
a. departing b. depressing
c. decreasing d. descending
depart 离开
depression 沮丧
decrease 减少
create 创造
increase 增加
cremate 烧尽、燃尽
descend 下降、遗传、（夜幕）降临
ascend 攀登、上升
condescend 屈尊、府就
descendant 后代
precursor 先人、先驱
descent 降落、世系
transcend 超越