听录音，根据你所听到的短文，将横线处补充完整，每空一词，听三遍。Last weekend, I __

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所属科目：小学英语

听录音，根据你所听到的短文，将横线处补充完整，每空一词，听三遍。

Last weekend, I _______ a farm with my family. We picked _______ and saw lots of cows there. There were many factories near the farm. _______ the factory, we saw a small river. But there were a lot of dead fish in the water. Our city is becoming _______ because of the smoke and rubbish. Our teacher _______ us we can take _______ or walk to school every day. We should use more _______ bottles and _______ bags. We can’t throw rubbish in the river or on the _______. What _______ things can we do?

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有奖纠错

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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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2019-09-19

用户名称

2019-09-19

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