听录音，补全短文，每空一词。 Long long ________, there were many

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类型：听音填空

难度系数：0.65

所属科目：小学英语

听录音，补全短文，每空一词。

Long long ________, there were many trees on ________. People could see them ________. Wood ________ ________ trees. We use wood to ________ tables, chairs and other things. We shouldn't use disposable chopsticks (一次性筷子). We shouldn't ________ ________ too many trees, for they help ________ the air ________. We should ________ books and paper from now on.

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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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