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17.He is too young to be able to ______ between right and wrong. A. discard B. discern C. disperse D. disregard 正确答案：B满分：2分 18.The portion of the total income of China’s railways which comes from carrying cargo is____80 percent. A. consequently B. roughly C. comparatively D. incidentally 正确答案：B满分：2分 19.Modern sonar makes it possible to ____ an underwater submarine. A. communicate B. sink C. search D. locate 正确答案：D满分：2分 20.We are quite sure that we can ______our present difficulties and finish the task according to schedule. A. get away B. get across C. get off D. get over 正确答案：D满分：2分 (责任编辑：admin)要这答案加QQ：800020900 或加微信：q800020900 获取 |
