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Daming: I feel ill. I’ve got a stomach ache.
Doctor: 1． like this?
Darning: Since Friday. I’ve been ill for about three days!
Doctor: I see. Let me 2． … Hmm, there’s no fever. What kind of food do you eat?
Daming: Usually fast food.
Doctor: Do you have breakfast?
Daming: No, not usually.
Doctor: That’s the problem! Fast food and no breakfast. That’s why you’ve got 3．.
Daming: OK, so what should I do?
Doctor: Well, don’t worry. It’s not serious. Stop 4． and have breakfast every day. And I’ll give you some medicine. Take it three times a day.
Daming: 5．, doctor.
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
