1.简述城市空气污染的危害;
2.提出解决该问题的建议:
(1)尽量少开车;(2)不随地扔垃圾;(3)关闭一些工厂;……
3.发出号召。
注意:1.词数:100左右;
2.可以适当增加细节,以使行文连贯;
3.开头与结尾已为你写好,但不计入总词数。
Dear teachers and students,
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Thank you!
The Student's Union
同类型试题
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
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