题目

 Tom’s father works ________ the chief engineer ________ a big company. He always works ________ high standards.        A. for; as; for      B. as; in; as     C. as; for; to     D. for; in; to 答案： C 下列跨膜运输的生理活动中，属于主动转运的是A．酒精进入胃黏膜细胞B．CO2进入肺泡内C．甘油进入细胞D．葡萄糖进入小肠绒毛上皮细胞