学进去-教育应平等而普惠
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类型:选内容补全对话
难度系数:0.65
所属科目:小学英语
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In 1906, Frank Fleer tried to 1. bubble gum (泡泡糖), but it didn’t taste good. No one wanted to buy it and Fleer felt 2.. Twenty years later, Fleer’s friend Walter Diemer had a better 3.. He put a special thing from trees in his bubble gum. Diemer did it! He invented “Dubble Bubble”. But there was a 4.: children didn’t know how to use bubble gum! The Fleer Company went to 5. and showed people how to blow bubbles! Later bubble gum became 6. around the world.

A.problem
B.make
C.idea
D.sad
E.cities
F.popular
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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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