题干
The waterfall can be seen_. Its sound may be heard two miles ____. It looks even more beautiful ____.
A：at a distance; in the distance of; from a distance
B：from a distance; in the distance of; at a distance
C：in the distance; from a distance; at a distance
D：in the distance; at a distance of; from a distance
答案(点此获取答案解析）
D
为了节省能量，某商场安装了智能化的电动扶梯。无人乘行时，扶梯运转得很慢；有人站上扶梯时，它会先慢慢加速，再匀速运转。一顾客乘扶梯上楼，恰好经历了这两个过程，如图所示。那么下列说法中正确的是（ ）