第19题: [单项选择]Why were only the months of January and July chosen to be coded A. To make the task more idealistic. B. These two months were appropriate representatives of the year. C. These months gave more opportunity for visitation. D. To make the task more realisti 参考答案:D 答案解析:文章第二段解释了为什么选择这两个月份:We chose 2 months that could reflect a range of sociability。这样也就使得他们的研究更加真实。