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问题 单项选择题

条码扫描译码过程是（）

A.光信号→数字信号→模拟电信号

B.光信号→模拟电信号→数字信号

C.模拟电信号→光信号→数字信号

D.数字信号→光信号→模拟电信号

答案

参考答案：B

完形填空
根据短文内容，从下面方框中选择适当的单词或词组填空，使短文内容完整正确。
easier;   knock;   mess;   trouble;   virus
I want to have a robot to help Mum with the daily work. I think that life is  小题1: when you have a robot, but Dad says that robots are just computers and can catch a   小题2:  easily. When this happens, you can have a lot of   小题3:  with it. Instead of helping you, it will make a  小题4: at home. It will  小题5: over lamps and furniture. And then you will decide to return it to the robot shop.
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选择题
The weather in Beijing is colder than______ in Guangdong.

A. it
B. the one
C. that
D. this
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