选择题:Our country isnearly________years old. Well celebrate its________birthday on Oct

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题目内容:

Our country isnearly________years old. We'll celebrate its________birthday on October 1, 2019around the country.

A.seventy, seventy

B.seventy, seventieth

C.seventieth, seventy

D.seventieth, seventieth

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答案解析:

定义集合 A﹣ B={x|x∈A 且 x∉B}. 已知集合 U={x∈Z|﹣ 2<x<6}, A={0, 2, 4, 5}, B={﹣ 1, 0, 3}, 则∁

定义集合 A﹣ B={x|x∈A 且 x∉B}. 已知集合 U={x∈Z|﹣ 2<x<6}, A={0, 2, 4, 5}, B={﹣ 1, 0, 3}, 则∁ U (A﹣ B) 中元素的个数为()

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Miss Zhao is very helpful. She often helps us ____we are in trouble.

Miss Zhao is very helpful. She often helps us ____we are in trouble.

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Father is too tired today. Don’t call him ________ it is necessary.

Father is too tired today. Don’t call him ________ it is necessary.

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We will never see Kobe play another basketball game, ________we will always reme

We will never see Kobe play another basketball game, ________we will always remember him.

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已知函数 f(x) =|2x+4|﹣ |x﹣ 1|.(1) 求不等式 f(x) >0 的解集

已知函数 f(x) =|2x+4|﹣ |x﹣ 1|.(1) 求不等式 f(x) >0 的解集

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