题目内容
书面表达
A: What's that? It looks strange.
B: It's ________ old machine.
A: What's it used ________ ?
B: It's used by people for getting ________ from a river or a lake.
A: How ________ it work?
B: Usually ________ people stand on it. They ________ the pedals (踏板) down hard with their ________ . Then water can be brought up.
A: What ________ it made of?
B: It's made of ________ . It can be seen ________ south China.
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