填空题

In fact, Earth does not have infinite resources as people believe to have.

【参考答案】

Y
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填空题
Pollution and other environmental deterrents will be irreversible damage to the ecological cycles.
问答题
1. 说明这一现象 2.解释产生这种现象的原因 3.预测未来的趋势 (说明:中国游客出国旅游开始于1997年。据统计,当年全国出境旅游的人数为520万人次,到2006年出境旅游的人数已超过3000万人次。)
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