4. As we know,Columbus(哥倫布) d      America in 1492.

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A;Do you have a paper towel(紙巾)， David?

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A: OK. I'll ask her. (Then Karl comes towards Cathy.)

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Water is the "life blood" of our earth. It is like air and sunshine，and it is very important 1       living things.2   water, there couldn't be any life on the earth. All animals and plants need water. Humans also need water. We need water 3      ，to cook and to clean4       It even makes up the greater part of our bodies.

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(   ) 3.______ students in our class can surf the Internet often. Some of them have no computers.

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1. It is________ (danger) to walk on the thin ice in a lake.

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4. Do you know who          (拿走)my CDs just now?  

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5. 如果人們不多種些樹，動物將沒有足夠的樹葉吃.

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