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问题 单项选择题

下列关于信息系统的叙述中错误的是（）。

A.电话是一种双向的、点对点的、以信息交互为主要目的的系统

B.网络聊天是一种双向的、以信息交互为目的的系统

C.广播是一种点到多点的双向信息交互系统

D.Internet是一种跨越全球的多功能信息系统

答案

参考答案：C

听力题

根据短文内容和中文提示补全短文，每空一词。

My name is Sarah, I want to share my story with you today. In my younger years, I always ate 小题1:   (每件事物) I liked and I never  小题2: （变得，成为）fat. Last year, I was too  小题3: (忙) to do sports and  小题4:(开始) many bad habits. So I got fatter and fatter, and I didn’t feel very well. What’s  小题5:(错误的,有毛病的) with me? My 小题6:(丈夫) thinks those bad habits are not good for my health. So I decide to do something to keep healthy. At first, I try to eat healthy food , then I often  小题7:(攀登，爬) mountains on weekends. Now I am 小题8: (瘦) again, and I also have a  小题9:(机会) to have good habits. I am so  小题10:(幸运的).
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单项选择题

立式钻床拆卸锥柄钻头时，应使用（）。

A、活动扳手

B、錾子

C、退钻削

D、钻头夹头扳手
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