皮皮学，免费搜题
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【简答题】
A．To chat with Simon socially. B．To get help in the course. C．To hand in their assignments. D．To practise giving interviews.
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】听力原文：M: Hello? W: Hello, Alan. This is Lucy. I'm in trouble. M: What happened? W: I'm afraid I won't be on the flight this afternoon. I got blocked in a traffic jam on the way to the airport and, by t...
A.
It had been cancelled when she arrived at the airport.
B.
She arrived at the airport too late to catch her flight.
C.
The plane was full when she arrived at the airport.
D.
She didn't have enough money to buy a ticket for the flight.
【简答题】先学习”零比特插入法“,再做对应习题:---- -请写出011111111111111111011111进行零比特插入法后的二进制位串。
【简答题】灭火器中所填充的灭火剂主要有哪几种?