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学进去-教育应平等而普惠
试题
类型:阅读选择
难度系数:0.65
所属科目:小学英语
阅读短文,选择正确的选项。
Hi, I am Feifei. I have got two good friends. One is Tingting, the other is Dingding. Tingting is a girl. She is very nice, she always helps me. But she is a bit quiet. Dingding is a boy, he is very clever, he can make birthday cards. But he is a bit naughty, he always plays in class. At the weekend, we often go swimming together.
1.Feifei has got ________ good friends. (   )
A.oneB.twoC.three
2.Tingting is a nice ________. (   )
A.boyB.manC.girl
3.Tingting is a bit ________. (   )
A.shyB.quietC.naughty
4.________ always plays in class. (   )
A.FeifeiB.TingtingC.Dinngding
5.They’ll go ________ at the weekend. (   )
A.swimmingB.skatingC.shopping
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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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