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索式提取器是由、、三部分组成的。

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咖啡碱具有强心、利尿、兴奋大脑中枢神经的作用，因此可作为的兴奋药。

What appliances can make us enjoy the smart life?

A. Smart phones
B. Sweeping robots
C. intelligent furniture
D. All of the above

According to Katie, what can help us to see an feel everything in the virtual world?

AR glasses
B. Robot fish
C. Flying robot
D. Robosapien

How do the people in London go to work or school?

A. bus
B. underground light railway
C. taxi
D. all of the above