我们组于2013年5月27 日，在学校门口的大街上随机发放35份问卷，其中20份是发放给男性，15份是给女性。共收回问卷35份，经checking，有效问卷为30份。
On 27th, May, 2013, our team has delivered 35 copies of questionnaire on the street before the school gate. 20 copies has been given to males, 15 copies has been given to the females. 35 copies has been taken back. After checking, 30 copies of the questionaire are effective.
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