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Today is Father’s Day. Amy wants to buy something for her father. What does she buy? She doesn’t buy a card or a book as usual (通常地). She doesn’t buy flowers. Look! She buys an MP5. She says it can help her father to learn English.
1．What does Amy buy for her father at last (最后)? ( )| A．A card. | B．An MP5. | C．Flowers. |
| A．Yes, she does. | B．No, she doesn’t. | C．We don’t know. |
| A．Because it’s her father’s birthday. |
| B．Because it’s Father’s Day. |
| C．Because it’s Christmas Day. |
5．What’s the adverb form (副词形式) of the word “usual”?
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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
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
