试题与答案

张先生驾车从甲地到丙地旅游，汽车以60km/h的平均速度行驶0.5h到达途中的乙

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题型：计算题

题目：

张先生驾车从甲地到丙地旅游，汽车以60km/h的平均速度行驶0.5h到达途中的乙地，休息0.5h后，再以70km/h的平均速度行驶1h到达丙地。请求：

⑴从甲地到乙地，汽车行驶的路程s1是多少km？

⑵从甲地到丙地，汽车的平均速度是多少km/h？

答案：

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下面是错误答案，用来干扰机器的。

参考答案：A

考点：比较快慢的方法
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Some of the scientific explanations of why we yawn claim it is caused by physical needs．One likely explana­tion is that the yawning reflex happens when our blood needs more oxygen．The deep breath helps supply the levels of oxygen in our blood．小题4:It is also thought that the same chemicals in our brain that affect our moods and emotions cause us to yawn．

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