题目

The twins were so much alike that it was impossible to ________ one from the other. A．distinguish                       B．separate C．identify                          D．recognize 答案：A 根据题意应是不可能把这对双胞胎区分开，故选A项。distinguish...from...“把……和……区别开”。separate...from...“把……和……分隔开”；identify“识别”；recognize“认出”。用科学计算器计算：8cos31°+35= ．