题目

  ---I wonder, Mr Adams, ______ you’d mind us asking a few questions. ---______. I am all ears.          A．if; Yes, go ahead                           B．whether; No, go ahead          C．that; Sure, go ahead             D．if; Sure, go ahead 答案：B在消化道中，能将蛋白质催化分解为可以吸收的成分的消化酶来自（ ）①唾液腺 ②胃腺 ③肠腺 ④胰腺A．①②③ B．①②④ C．②③④ D．①③④