April Fool’s Day (愚人节)is on April 1st. You can play tricks on others on that day. And no one is angry with you.
Here is a story about it. The story happens in the classroom. All the students are listening carefully in class ( 除了 ) except Nick. He is writing something on a piece of paper. The teacher comes up to him and asks , “Can you show me what you are writing on the paper?” Nick says, “You mustn’t read it.” “Give it to me,” the teacher is angry.
Nick is a little worried. But he has to hand the paper over to the teacher. On the paper, it says, “You mustn’t read it, you fool!”
1. When is April Fool’s Day?
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2. What can you do on that day?
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3. Where does the story happen?
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4. Is Nick listening carefully in class?
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5. What does Nick write on the paper?
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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