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【题目】As a result, the number of kinds of animals, birds, insects and trees in the world ________ bedecreasing(减少)

【答案】is

【解析】

句意:结果,世界上的动物、鸟类、昆虫和树木的种类正在减少。

短语the number of:……的数量,做主语时,谓语动词使用单数。故填is

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