音声の再生 - 株式会社大修館書店

STEP 8
ハイパーリンクを貼る
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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.

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