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试题
类型：完形填空
难度系数：0.65
所属科目：小学英语
完形填空。

Look, it’s our Earth. There ____ some water, hills and trees on it. We shouldn’t ____ water. Because in many places, there is not ____ water.

We also ____ cut down too many trees. We should ____ more trees. They are ____ for the air. People like using ____ bags in the supermarket. But I think they’re bad for the Earth. We should use ____ bags and boxes. The Earth is our ____. We should ____ it.

1．
A．isB．areC．aren’tD．isn’t
2．
A．saveB．keepC．wasteD．saved
3．
A．manyB．muchC．someD．lot of
4．
A．shouldB．canC．shouldn’tD．mustn’t
5．
A．makeB．plantC．keepD．save
6．
A．badB．useC．usefulD．well
7．
A．paperB．plasticC．glassD．hard
8．
A．paperB．plasticC．glassD．soft
9．
A．schoolB．homeC．gardenD．park
10．
A．protectB．not protectC．wasteD．not waste
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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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