作例4 89p テキストの一部を隠す(1)

作例⑦ p. 97
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Over 70 percent of the surface of the
earth is covered with water. That is why
the earth is called the “water planet.” As
you can see on this chart, however, the
water available for human use is only
about 0.03 percent of the total amount of
the earth’s water. More than seven billion
people and all other animals and plants
must share this limited resource.