问题
填空题
汽车由甲地行驶到乙地的平均速率是4.0m/s，由乙地返回到甲地的平均速率是6.0m/s，则汽车在甲乙两地之间往返的平均速率为____________m/s，平均速度为____________m/s。
答案
4.8，0
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汽车由甲地行驶到乙地的平均速率是4.0m/s，由乙地返回到甲地的平均速率是6.0m/s，则汽车在甲乙两地之间往返的平均速率为____________m/s，平均速度为____________m/s。
4.8，0
根据对话内容，从方框中的六个选项中选出五个合适的句子补全对话。 Linda: Hello, 76_____________ . Peter: I’m reading a book about the people’s lives in the future. Linda: Oh, it’s interesting. What will the people’s lives be in the future? 77________ Peter: Yes, I think so, but I hope not. Linda:78________ Peter: Because there won’t be enough food, fuel and room for too many people on the earth! Linda: That’s true. 79_______ Peter: It’s too hard. But maybe people will have on space stations (空间站) on the moon and grow vegetables (种植蔬菜)there. Linda: 80______. By the way, do you think everyone will speak the same language in the future? Peter: I hope so. Then people in different countries will understand each other better.
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