题目

下图是人体细胞内发生的某个化学反应示意图，图中X代表某种双糖，则催化该反应的酶Y及其产物分别是（   ） A．淀粉酶；麦芽糖和葡萄糖                   B．蔗糖酶；葡萄糖和果糖 C．麦芽糖酶；葡萄糖和葡萄糖               D．乳糖酶；葡萄糖和半乳糖 答案：D 解析: 人体内的双糖为乳糖，其水解产物为葡萄糖和半乳糖。Only when students _____ willing to learn can they be active _____ learning activities. [     ]A. will become; in   C. become; with   C. will become; for  D. become; in