文章作者 100test 发表时间 2007:10:15 11:57:49
来源 100Test.Com百考试题网
Passage 6
We cannot feel speed. But our senses let us know that we are moving. We see things moving past us and feel that we are being shaken.
We can feel acceleration, an increase in speed. But we notice it for only a short time. For instance, we fell it during the takeoff run of an airliner.
We feel the plane’s acceleration because our bodies do not gain speed as fast as the plane does. It seems that something is pushing us back against the seat. Actually, our bodies are trying to stay in the same place. While the plane is carrying us forward.
Soon the plane reaches a steady speed. Then, because there is no longer any change in speed, the feeling of forward motion stops.
1. We can tell that we are moving by _____.
A.