单项选择题

A．

B．

C．

D．

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单项选择题

2. Listen and choose the answer to the following questions.
6) What have many people switched to while face-to-face contact has become difficult?
A、A. Social bond.
B、B. Marginal friendship.
C、C. Video chats.
D、D. A shared workplace.

单项选择题

工业上负载的性质大都是容性的。（）

A．对
B．错