Kangaroos have increased in number because of_________

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【线索词】Kangaroos 【定位处】倒数第二段末句
【解析】the fence。本题考查澳大利亚袋鼠泛滥的原因。该句明确提到，Now they are ubiquitous for without a native predator the kangaroo population has exploded inside the Fence．即现在它们在没有本地食肉动物的围栏内到处存在，袋鼠的数量已经剧增。由此可知，the fence即为袋鼠迅速增长的原因.
【设题处】因果处设题

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