题目：
Directions:
Suppose you are a college student on a school campus or an employee in a company. Recently you noticed that some people never paid attention to the signs on a garbage can that say it is desirable to deal with wastes separately. Now you are going to make a conservation campaign speech at a party. And your speech should include:
1) the present situation,
2) and your suggestions.
Write your letter in no less than 100 words. Write it neatly on ANSWER SHEET 2.
Do not sign your own name at the end of the letter, use "Li Ming" instead.
Do not write the address.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A解析：[考点] 合同成立时间 《合同法》第25条规定，承诺生效时合同成立。《合同法》第26条第1款规定，承诺通知到达要约人时生效。承诺不需要通知的，根据交易习惯或者要约的要求作出承诺的行为...
