There are four s1． in a year. I like autumn best ( - 学进去中小学试卷试题库

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类型：选内容补全对话

难度系数：0.40

所属科目：小学英语

There are four s1． in a year. I like autumn best (最). It is in S2．, October and N3．. It c4． after summer. We usually go and look at the falling leaves. They are beautiful. Sometimes we go c5． with our family or friends. The Mid-Autumn Festival and the Double Ninth Festival are in autumn. We get t6． with our families. We always have lots of f7．.

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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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