meadow — The children played in the meadow near Senfarrow Brook.
waterfall — The waterfall fell 30 meters down the rock.
thunder — The thunder was very loud during the storm.
litter — People should not throw litter on the ground.
试一试: Mei hears a loud noise in the sky during the storm. That noise is ___. (thunder / litter / meadow) 答案: thunder — Thunder 是暴风雨里的巨大声响，这正是 Mei 听到的。Litter 是地上的垃圾，meadow 是草地，所以两个都不是声音。
试一试: Lars sees water falling down the rocks from high up. He is looking at a ___. (waterfall / meadow / thunder) 答案: waterfall — Waterfall 是顺着岩石落下的水，这正是 Lars 看到的。Meadow 是平坦的草地，thunder 是声音，所以两个都不是在讲落下的水。