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问题 单项选择题

下面关于光网络的说法中，不正确的是（）。

A.光网络中信号始终以光的形式传递

B.光网络中，需要进行光/电、电/光的转换

C.光网络节点包括光的光上下路以及光的交叉互连等

D.光网络技术能够解决已有网络在节点处信息交换的电子"瓶颈"

答案

参考答案：B

听力题

阅读下面短文，请根据所给中文正确拼写单词，使短文意思完整。每空限填一词。(10分)

David正在做英语老师布置的作业,在班级主页的论坛上发表自己的有关健康的帖子,但是一些刚学过的英语单词忘了，请你根据所给中文提示正确拼写单词，使他的短文意思完整正确。

How important keeping healthy to everyone is！There are many __小题1: (方法) to keep healthy.

Food is very important to everyone’s health. Healthy food may keep you healthy, but unhealthy food may cause some 小题2:(问题)of your body. We should eat more _小题3:(蔬菜) and fruits, and don’t eat too _小题4:(多) sweet food. I’d like to eat food that 小题5:  (它的) smell is nice and that __小题6: (品尝) good. Actually, we should eat a balanced diet.

_小题7:(睡觉)is also important to everyone’s health. We need at least __小题8:  (八) hours’ sleep every night. If you don’t sleep well at night, maybe you will feel sleepy in the day time, and you will do __小题9: (更坏) in your schoolwork.

We should do_小题10:_(运动) often to keep healthy.

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单项选择题

对会计核算的范围从空间上加以界定是通过( )实现的。

A．持续经营假设
B．会计主体假设
C．会计分期假设
D．货币计量假设
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