Many Americans mindlessly oppose hunting. They do so even in cases where animal populations are dangerous high. In

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问题     Many Americans mindlessly oppose hunting. They do so even in
cases where animal populations are dangerous high. In                    【S1】______
some areas of Alaska, wolves have become so rare that they               【S2】______
are running out of hunting ground and prey heavily on
moose, deer, and occasionally dogs. In past, game                        【S3】______
managers curbed wolf populations for trapping and aerial                 【S4】______
hunting without wiping away the species. Still, whenever,                【S5】______
they propose do this nowadays, they receive tens                         【S6】______
of thousands letters of protest. Growing deer populations in             【S7】______
parts of California threat to starve themselves out. Seaotter            【S8】______
colonies, booming in the Pacific coast, are fast running                 【S9】______
out of food, too, as good as putting commercial                          【S10】______
fisher-men out of business.
【S4】

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答案for→by

解析 此处表示“通过设陷阱等方法来遏制狼群的数量”,如果用for,是表示“为了什么目的而做什么”,此处不符合文章意思。
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