During the day we work and play, at night we sleep. Our body rests while we sleep. In the ______ we are ready to work and play again. Our body grows most while we are asleep. Children who are tired usually need ______ sleep. We can learn our lessons better ______ we have had plenty of rest. Our body needs plenty of air when we sleep. ______ we do not get enough fresh air, we will feel tired when we wake up. While in bed we ______ not cover our heads. Our lungs (肺) need to get enough fresh air. If we ______ our window at night, we can have plenty of fresh air. Cool air is better than warm air.
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同类型试题
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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
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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
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