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Our body rests while we sleep. Our body grows most while we are asleep. Children who are tired usually need more sleep. We can get at our lessons better, after we have had plenty of rest. Boys and girls who are eight or nine years old need ten hours of sleep every night. If we do not get enough fresh air, we will feel tired when we wake up. While in bed we must not cover our heads. Our lungs （肺） need to get enough fresh air. If we open our windows at night, we can have plenty of fresh air. Cool air is better than warm air.
1．Our body grows most while we are eating.2．Too much sleep makes us unhappy.
3．Our body doesn't need plenty of air when we sleep.
4．Cool air is better than warm air.
5．When children are tired, they need to go to bed for rest.
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
