题目

We’d better take a train , because the train travels at least ______ the boat .A. five times as fast as      B.five times fast than  C. as five times fast as      D. faster five times than  答案：A切除了狗的某内分泌腺后，出现行动迟缓精神萎糜、食欲不振、发育停止等现象，此内分泌腺是( )A.垂体 B.甲状腺 C.性腺 D.胰腺