第71題： Many Chinese museums and art galleries rolled out online exhibitions，courses and other online services，allowing netizens to take virtual tours and enjoy splendid art feasts online. Which one is not the technology support to this service（）。
A．5G
B．Virtual rreality （VR）
C．Ultrahigh definition video
D．Block chain
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第72題： （）is not the application scenario of artificial intelligence.
A．a(chǎn)utonomous robot
B．face recognition
C．self-driving
D．conditioned reflex
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第73題： This （）is the work defined at the lowest level of the WBS for which cost and duration can be estimated and managed.
A．a(chǎn)ctivity
B．planning package
C．work package
D．requirement
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第75題： The（） phase is where the team members meet and learn about the project and their formal roles and responsibilities.
A．norming
B．storming
C．forming
D．performing
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