1 . The book I have chosen is Family Correspondence of Fulei, ________ Fu Lei shared his views about art and life. (用适当的词填空)
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19-20高二·全国·课后作业
2 . Mathematical models have also revealed that food webs may be unstable,___________ small changes of top predators can lead to big effects throughout entire ecosystems. (单词的适当形式填空)
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