听录音，选出正确的答语。( ) 1. A. At 7 o’clock.

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类型：听音，选择正确答案

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所属科目：小学英语

听录音，选出正确的答语。
(      ) 1. A. At 7 o’clock.                       B. You are busy!                      C. That’s too late.
(      ) 2. A. In the morning.                    B. In the shop.                         C. With his friends.
(      ) 3. A. I often go shopping.             B. I can play basketball.             C. I’m hard-working.
(      ) 4. A. Yes, I am.                            B. No, she doesn’t.                  C. Yes, I do.
(      ) 5. A. I usually clean my room.        B. I go shopping on Sundays.     C. Because my mother is busy.

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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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