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1. Once ecosystems pass their tipping point (临界点),it is
(remarkable) difficult for them to return.
【考点】
副词的用法;
【答案】
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语法填空（单句）
普通
课时演练
换一批
1. When he looked to the side,he saw
(instant) that it wasn't a dog at all,but a wolf.
语法填空（单句）
普通
2. 该是我们采取措施阻止空气污染的时候了。(keep...from)
It is high time that we took measures to
.
句子翻译
普通
3. Every weekend,
(have) a great time is the order for both audiences and comedy stars in "Wales" premier comedy club.
语法填空（单句）
普通