阅读下列短文，掌握其大意，然后用方框中所给的词的适当形式填空。A. rapidly B. under

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类型：用单词的正确形式完成短文

难度系数：0.40

所属科目：初中英语

阅读下列短文，掌握其大意，然后用方框中所给的词的适当形式填空。

A. rapidly B. understanding C. hold D. languages E. needed F. widely

English is the most 1． used language in the world. It’s used as the mother tongue by most people in many countries. It’s also one of the working 2． in the U.N. China is developing 3． and Beijing hosted 2008 Olympic Games. If we want to communicate with foreigners and prevent them from having trouble 4．, more and more people who can speak English well are 5．.

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y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2

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2019-09-19

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2019-09-19

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