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A．单句填空 1．We need to get to the root of the problem ________ we can solve it. 答案 before [句意：在能够解决这个问题之前，我们需要找到它的根源所在。根据句意可知用before。] 2．Just ________ a single word can change the meaning of a sentence, a single sentence can change the meaning of a paragraph. 答案 as [句意：正如一个词可以改变一个句子的意思一样，一个句子可以改变一个段落的意思。根据句意可知用as。] 3．________ scientists have learned a lot about the universe, there is much we still don't know. 答案 Although/Though/While [句意：虽然科学家已经了解了很多有关宇宙的东西，但是还有很多我们不知道的。根据句意可知填Although/Though/While。] 4．________ he once felt like giving up, he now has the determination to push further and keep on going. 答案 Where [句意：在他曾经想要放弃的地方，他现在有决心进一步推进并且坚持下去了。根据句意可知用Where。] 5．________ the students came from different countries, they got along quite well in the summer camp. 答案 Although/Though/While [句意：虽然这些学生来自不同的国家，但他们在这个夏令营中相处得很好。根据句意可知用Although/Though/While。] | 
