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1. Ecotourism is commonly regarded
low impact(影响) travel to undisturbed places.
【考点】
固定短语; 简单介词;
【答案】
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语法填空（单句）
普通
课时演练
换一批
1. Most fields are still made of grass rather than AstroTurf(阿斯特罗人造草皮), which means workers need to take care of it
a day-to-day basis.
语法填空（单句）
普通
2. During the lockdown some people are
urgent need of the goods.
语法填空（单句）
普通
3. But we failed to convince him
his mistake.（用适当的介词/副词填空）
语法填空（单句）
普通