填空题

Tropical forests is the main suppliers of ______ that we breathe.

【参考答案】

the oxygen
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填空题
The earth’s forest provide us with service from ______ to fruit and fresh air-and to seek to finance their conservation by charging those who benefit from them.
单项选择题
A．A peasant.B．A famous man.C．A Russian.D．A writer.
A．A peasant.
B．A famous man.
C．A Russian.
D．A writer.
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