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假设你是刘军，在上周末的乡村旅游中，你发现了一些游客的不文明行为。请根据下表信息给某英文报VOICE栏目的编辑写一封邮件，反映这些问题并提出建议。
Uncivilized behaviors | Suggestions |
| ● threw rubbish everywhere ● picked flowers ● climbed trees | ● put rubbish into bins ● … |
（1）邮件内容必须包括上表所有信息，可适当增加细节；
（2）你的建议至少两条；
（3）词数：80—100；
（4）邮件开头和结尾已给出，不计入总词数。
参考词汇：不文明行为uncivilized behavior；编辑editor
Dear editor,
I was shocked to see some uncivilized behaviors when I took a trip to a village last weekend. _______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Yours sincerely,
Liu Jun
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
