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— Hi, Jack. What are you looking for?
— My new pen. I can't find it.
— Is it under your books?
— No, it isn't here.
— Is it in your desk?
— No, it isn't in the desk.
— Maybe it's in your bag.
— No, it isn't.
— Well, I think you should talk to the teacher. She can help you.
(1)Jack is looking for ________.
(2)The pen is not under the ________.
(3)The pen is not in the ________.
(4)________ can help Jack.
同类型试题
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
