题目

19世纪末，欧洲出现两大军事集团局面的标志是：（    ）A、德奥同盟条约的缔结     B、法俄同盟的形成C、三国同盟的正式成立     D、英俄协约的签订 答案：B—Is Mr. Green really very ill? —            . He has to stay at home for a good rest. [     ]A. I don't think so B. No, he isn't C. I hope so D. I'm afraid so