题目内容
[音频]
A. Set up his mum's computer.
Buy his mum a birthday gift.
C. Solve his dad's computer problems.
D. Help his dad choose a new computer.
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[音频]
A. They never had a computer of their own.
B. They had little or no experience with computers.
C. Nobody taught them how to use computers.
D. Nobody helped them with their computer problems.
[音频]
A. It would be silly.
B. It would be boring.
C. It would be amazing.
D. It would be unimaginable.
[音频]
A. They get bored without electronic things.
B. They are happy without electronic things.
C. They wish they had more experience with electronic things.
D. They hope their grandchildren would use electronic things less.
555电路共有 个引脚， 号引脚为输出端。
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