survey for ecology lab
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资源简介：
Three researcher were gathered in front of the student center on Wednesday, 17 of September. In this 15 minutes survey, the student who were out of the student centre were observed and investigated by these researchers.Students were observed whether they were female or male, whether they were using their cell phone (talking or playing on the phone) or not and moreover the number of their siblings were asked.
创建时间：
2014-09-19
