完成对话. 根据对话内容, 在空白处填写适当的话语 (话语可能是一个句子, 也
题型：补全对话，情景问答
问题：
完成对话.
根据对话内容, 在空白处填写适当的话语 (话语可能是一个句子, 也可能是一个短语或
一个词), 使对话完整.
( Li Lei and his classmates are in a museum. Now he is introducing an invention to a foreign student.)
Melissa: Look! This looks so interesting. There are dragons (龙) and frogs on it.
Li Lei: Ah, it's a great __1__ of ancient China.
Melissa: Really? __2__?
Li Lei: I think it was invented in Han Dynasty (汉朝).
Melissa: __3__?
Li Lei: Guess!
Melissa: Was it used for holding water?
Li Lei: No. It was used or testing earthquakes.
Melissa: Really? But how?
Li Lei: Read this instruction, and __4__.
Melissa: Wow, it's really __5__. The Chinese are great.
