填空题

Two-thirds of the freshwater on Earth is locked in ______.

【参考答案】

glaciers and ice caps
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A．Talk to his sister.B．Look at a map.C．Go on a diet.D．Tell the man why.
A．Talk to his sister.
B．Look at a map.
C．Go on a diet.
D．Tell the man why.
填空题
In developed countries, before toxic chemicals are released into rivers and lakes; they should be treated in order to avoid ______.
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