听音，选出你听到的句子，把序号写在括号里，每个小题读两遍。( ) 1. A. I ha

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所属科目：小学英语

听音，选出你听到的句子，把序号写在括号里，每个小题读两遍。
(        ) 1. A. I have 3 pens.                            B. I have 5 pencils.                      C. I have 6 books.
(        ) 2. A. My hair is white.                      B. My hair is brown.                      C. My hair is black.
(        ) 3. A. My brother is eight years old.        B. My brother is nine years old.       C. My brother is ten years old.
(        ) 4. A. Close your left eye.                      B. Close your right eye.               C. Close your left hand.
(        ) 5. A. This book is for you.               B. This cake is for you.                      C. This desk is for you.

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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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