听短文，选择。( ) 1. George and Tony are ______.A. b

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听短文，选择。
(      ) 1. George and Tony are ______.
A. brothers                           B. classmates                           C. friends
(      ) 2. ______ is not George’s hobby.
A. Playing football                    B. Playing ping-pong              C. Swimming
(      ) 3. George’s father is ______.
A. a football player                    B. a businessman                    C. a teacher
(      ) 4. George’s father often goes to work ______.
A. by bike                           B. by car                                  C. by plane
(      ) 5. George’s mother works in ______.
A. a big company                    B. a university                           C. a big factory

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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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