听问句，选出合适的答句。( ) 1. A. My father.

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类型：听音，选择正确答案

难度系数：0.65

所属科目：小学英语

听问句，选出合适的答句。
( ) 1. A. My father.                  B. My mother is.                C. It’s my father.
( ) 2. A. I went to the park.          B. I flew a kite.                       C. I was ill.
( ) 3. A. Yes, there is.                 B. No, there wasn’t.               C. Yes, there were.
( ) 4. A. At half past four.        B. It’s five.                       C. I’m twelve.
( ) 5. A. That’s great.               B. I like singing.               C. I wanted to give you a book.

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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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