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

【答案】is

【解析】

句意:結(jié)果,世界上的動(dòng)物、鳥(niǎo)類、昆蟲(chóng)和樹(shù)木的種類正在減少。

短語(yǔ)the number of:……的數(shù)量,做主語(yǔ)時(shí),謂語(yǔ)動(dòng)詞使用單數(shù)。故填is

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