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1. How old is the earth? A. 160 million years B. 86 billion years C. 4.6 billion years
2. Approximately, how many population are there on the earth? A. 6.4 billions B. 2.5 billions C. 56 billions
3. What is the proportion of land area to total area of the earth? A. 63% B. 35% C. 29%
4. What is the proportion of fresh water to the total amount of water on the earth? A. 26% B. 3% C. 0.26%
5. Which length should be longest length of the earth? A. Circumference B. Radius C. Diameter
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1.C
2.A
3.C
4.B
5.A
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