What does the woman want to do now A. To buy a ticket. B. To check in. C. To receive a guest. D. To return a ticket. 参考答案:B 答案解析:[听力原文] W:Excuse me.Can you help me M:Yes W:I have a ticket to Seattle.Where can I check i
第23题: [单项选择]精子的尾()。 A. 形似蝌蚪 B. 呈圆形 C. 覆盖精子头的前部 D. 由核和顶体组成 E. 精子的运动器官 参考答案:E