The ecology of an area is ______________48 where an environment is u-考呗网

英语三级A级

填空题 The ecology of an area is ______________48 where an environment is undisturbed.

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【答案】in balance
【解析】由第二段第二句“Where an environment is undisturbed，the ecology of an areais in balance．”可以得到答案。

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