【正确答案】 B

【答案解析】[听力原文]8-10 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 example, we feel it during the takeoff of an airplane. We feel the plane's acceleration because our bodies do not get 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 forward motion stops. 8. What lets us know that we are moving? 抓听“We cannot feel speed. But our senses let us know that we are moving.”这句话得出B项正确。

【正确答案】 A

【答案解析】[听力原文] How long can we feel acceleration? 听懂“we can feel acceleration, an increase in speed. But we notice it for only a short time.”这句话后可以得出A项正确。

【正确答案】 D

【答案解析】[听力原文] What is the acceleration? 注意听懂问题“What is the acceleration?(什么是加速?)”结合听懂的“We can feel acceleration, an increase in speed.”得出D项正确。