题目

听材料，回答问题。 （1） What day did the conversation take place? A . Thursday. B . Friday. C . Saturday. （2） Why did the man make the call? A . To invite Linda to the cinema with him. B . To ask Linda to attend a meeting together. C . To inform Linda of the change of their plan. （3） What can we know from the conversation? A . The woman refused to help the man. B . The man made a wrong telephone call. C . Linda Johnson never heard of Tina.某校高三年级有男生500人，女生400人，为了解该年级学生的健康情况，从男生中任意抽取25人，从女生中任意抽取20人进行调查.这种抽样方法是（  ）A．简单随机抽样法B．抽签法C．随机数表法D．分层抽样法