题目内容：
The ecology of an area is ______________48 where an environment is undisturbed.参考答案：
答案解析：
填空题：The ecology of an area is ______________48 where an environ
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The projects ______________by the end of 2002 will expand t
The projects ______________by the end of 2002 will expand the city' s telephone
She moved away from her parents, and missed them___________
She moved away from her parents, and missed them______________enjoy the excitin
Cement was seldom used in building during the Middle Ages.A
Cement was seldom used in building during the Middle Ages.A crudelyB rarelyC
A．setting B．putting C．listing D．raising
A．setting B．putting C．listing D．raising
Who were invited to join the worldwide movement to rid film
Who were invited to join the worldwide movement to rid films of their tobacco-