单项选择题
What does the passage tell us about American rivers（）
A．One sixth of them are seriously polluted. B．One third of them arc seriously polluted. C．Half of them are seriously polluted. D．Most of them are seriously polluted.
单项选择题 What does the man mean（）
单项选择题 What does the woman mean（）
单项选择题 The tenant must be prepared to decorate the house （）the terms of the contract.
