Passage 2
Questions 8 to 10 are based on the passage you have just heard.
[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.
Passage 1
Questions 6 and 7 are based on the passage you have just heard.
[听力原文]6-7
Finding enough meat was a problem for primitive man Keeping it when it was scarce was just as hard, Three ways were found to keep meat from spoiling: salting, drying, and freezing.
People near salty waters salted their meat. At first, they probably rubbed dry salt on it. but this preserved only the outside. Later they may have pickled their meat by soaking it in salt water.
In hot, dry lands, men found that they could eat meat that had dried while it was still on the bones. They later learned to cat meat into thin stops and hang it up to dry in the hot air
Men in cold climates found that frozen meat did not spoil. They could leave their meat outside and eat it when they pleased.
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