问题详情：
补全对话
根据下面的对话情景，在每个空白处填上一个适当的句子，使对话的意思连贯、完整。
A: What a nice camera! 1.
B: It was invented by Joseph Nicephore Niepee.
A: Oh, I see. 2.
B: In 1827.
A: What’s this in English? It looks like a recorder.
B: It’s called an English Learning Machine.
A: 3.
B: It may be made of steel.
A: 4.
B: It is used for helping us to improve our English.
A: Thanks for telling me so much.
B: 5.
【回答】
1. Who(m) was it invented by?/ By whom was it invented?/ Who invented it?
was it invented?
may it be made of?
is it used for doing?
’re welcome./ Not at all.(意思相近均可)
知识点：补充句子
题型：补全对话
