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运用 填入一个恰当的词或完成句子。 ⑴ Your explanation was really a puzzle __ me. ⑵ His recent behavior_________ (使我困惑). to puzzles me 原句 They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space. 他们把过多的二氧化碳释放到大气层中, 这使得地球上的热不能释放到太空中去。(B3 P26) 4. prevent /stop /keep...from 阻止/防止……做/发生…… 提示 在主动语态的句子中, stop和 prevent后的from可省略, 但keep后的from不能省略; 在被动语态中, 此三个短语中的from 均不可省略。 比较 protect ...from ... 保护……不受…… 例句 The farmer built a wall to prevent his chickens from running out. 那个农民建了围墙来防止鸡跑出去。 运用 根据汉语提示完成句子。 ⑴上涨的河水使我们过不了河。 The rising water _________________ _________________ . ⑵人们采取行动来防止环境的恶化。 People took measures ___________ _______________________________. prevented us from crossing the river to prevent the environment from getting worse 原句 Walking does need a bit of practice now that gravity has changed. 重力改变了, 看来走路也的确需要练一练了。(B3 P31) 5. now that 由于; 既然 例句 | 
