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即境活用18 Some researchers believe that there is no doubt________a cure for AIDS will be found. A．how B．what C．that D．whether [解析]此处为“There is no doubt that...”句型。 [答案]C 2．It's OK to leave an electrical appliance on so long as you are using it—if not, turn it off！在使用电器设备时，你可以让它开着——如果不用就把它关掉。 该句中so long as＝as long as是连词，引导条件状语从句。句中if not是if you are not using it的省略形式。如果要表示肯定，则用if so，意思是“如果是这样”。 We'll go out so/as long as the weather is fine. 只要天气好，我们就会出去。 So long as you put your heart into it, nothing will be difficult for you any longer. 只要你用心，没有什么能难倒你。 Is anybody feeling cold？If not, let's put the central heating off. 有谁感到冷吗？如果没有，就把暖气关掉。 即境活用19 It is said that there is a flight at midday. If________， you'll have to wait for another 5 hours. A．so B．such C．any D．not [解析]if not是if there is not a flight的省略。 [答案]D 即境活用20 (2017·吉林市毕业班摸底考试)—Have you got any idea for the summer vacation? —I don't mind where to go________there's sun，sea and beach. A．as if B．as long as C．now that D．for fear that [解析]as long as 只要，引出条件状语从句。 [答案]B 堂 课 双 基 Ⅰ.词义辨析 1．Most air pollution is caused by the burning of ________ like coal，gas and oil. A．fuels B．articles C．goods | 
