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If you have headache and a sore throat, you may have the flu. If you have the flu, you usually have a fever and need to see a doctor. You should take some medicine and drink lots of warm water. You should stay in bed for a few days and then you will feel better.
1．If you have the flu, you don't feel sick. （
2．If you have the flu, you usually have a fever. （
3．If you have the flu, you needn't drink warm water. （
4．If you have the flu, you shouldn't play sports. （
5．If you have the flu, you should take some medicine. （
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
