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第1题

Washoe, a female chimpanzee (黑猩猩) believed to be the first non-human to acquire human language, has died of natural caus
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第2题

对于备货型企业，在年生产计划中，确定（）是最重要的决策
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第3题

Do you know why different animals or pests (昆虫) have their special colors? Colors in them seem to be used mainly to prot
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第4题

Wugging, or web use giving, describes the act of giving to charity at no cost to the user. By using Everyclick.com, whic
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