19.What had the instructor probably been discussing in the previous class? 【解析】[D]从学生的回答中you said in the last class, I think, that convection is the transferring of heat by a liquid or a gas中可推断出上节课教师讲的是对流的问题。 20.What ...
she heard a 37 voice. “Hold on! I’m coming. ” With 38 , she saw the old man rowing an ancient-loking boat towards her, ,”I hope you’ ve leamed a lesson. You put us both in39.” he shouted angrily, as he dragged her over the side of the 40 . Gr...
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