学进去-教育应平等而普惠
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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
听录音,根据所听短文,选择正确的答案。(听两遍)
______) 1. How old is Lucy?
A. She is twelve.                       B. She is twenty.               C. She is eleven.
______) 2. How do Lucy and Lily go to school?
A. By bike.                           B. On foot.                   C. By car.
______) 3. What does Lucy like doing?
A. She likes dancing.                   B. She likes singing.           C. She likes swimming.
______) 4. What does Lily like doing?
A. She likes dancing with her friends.       B. She likes singing.           C. She likes swimming.
______) 5. What do Lucy and Lily often do in the evening?
A. They often watch TV.                   B. They often read books.       C. They often listen to music.
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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

用户名称
2019-09-19

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

用户名称
2019-09-19
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