题目

下列有关酶的实验设计思路正确的是（） A . 利用淀粉、蔗糖、淀粉酶和碘液验证酶的专一性 B . 利用过氧化氢和过氧化氢酶探究温度对酶活性的影响 C . 利用过氧化氢、新鲜的猪肝研磨液和氯化铁溶液研究酶的高效性 D . 利用胃蛋白酶、蛋清和pH分别为3、7、11的缓冲液验证pH对酶活性的影响 答案：C Mary and Peter’s plan for next week Mary Peter Sunday 8:00 supper with Betty and Ann basketball team party 9:00 pm Monday 7:30 go to the cinema Study group meeting 3:00pm Tuesday 11:00 doctor Basketball match 4:30 pm Wednesday 9:00 table tennis game Evening-study for exam go to see some friends 2:00pm Thursday 8:30 concert Noon，lunch with Larry Friday Afternoon-help Uncle Sam in his restaurant 2:00-4:00 pm Volunteer(志愿者) work at student centre Saturday 9:00—1 0:30 art class 2:00 visit grandmother Shopping 10:00 am 1．On Sunday morning Mary will __________．   A．be free          B．be busy       C．see the doctor    D．go shopping 2．What will Mary do on Wednesday evening?   A．See her friends．               B．Play basketball．   C．Go to her art class．             D．Prepare for(准备)an exam． 3．Peter’s study group meeting will be on __________．   A．Sunday morning                B．Monday afternoon   C．Saturday evening               D．Friday afternoon 4．From Peter’s plan we learn that Peter likes __________．   A．table tennis       B．music       C．art        D．basketball 5．What will Peter do on Saturday morning?   A．Go to see some friends．       B．Have a basketball match   C．Have lunch with Larry．       D．Go shopping．