学进去-教育应平等而普惠
试题
类型:完形填空
难度系数:0.65
所属科目:小学英语

   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.

1.
A.afternoonB.morningC.eveningD.midnight
2.
A.moreB.severalC.manyD.lots of
3.
A.beforeB.besideC.afterD.in front of
4.
A.IfB.HoweverC.ButD.When
5.
A.needB.mayC.mustD.might
6.
A.closeB.turn upC.turn onD.open
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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

用户名称
2019-09-19

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

用户名称
2019-09-19
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