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问题 单项选择题 A1型题

关于维生素PP说法错误的是（）

A.有明显的氧化还原功能

B.构成脱氢酶的辅酶

C.维持皮肤与神经的健康

D.来源于动物肝脏、豆类、花生等

E.成年人供给量：男性12～17mg/d，女性11～16mg/d

答案

参考答案：A

解析：维生素PP构成脱氢酶的辅酶，维持皮肤与神经的健康，来源于动物肝脏、豆类、花生等，成年人供给量：男性12～17mg/d，女性11～16mg/d。

完形填空

（2）语法填空

I was being tested for a driving license ___1___ the third time. I had been asked to drive in heavy traffic and had done so ___2___(succeed). After ___3___ (instruct) to drive out of town, I began to acquire confidence. Sure that I had passed, I was almost beginning to enjoy ___4___ test. The examiner must have been pleased with my ___5___(perform), for he smiled and said. “Just one more thing, Mr. Eames. Let us suppose that a child suddenly crosses the road in front of you. As soon as I tap on the window, you must stop ___6___ five feet.” I continued driving and after some time, the examiner tapped loudly, ___7___ the sound could ___8___ (hear) clearly, ___9___ took me a long time to react. I suddenly pressed the brake pedal(刹车踏板)and both of us were thrown forward. The examiner looked at me sadly. 'Mr. Eames,' he said, ___10___ a mournful voice, “you have just killed that child!”
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问答题 论述题

论述等电位作业时如何转移电位的。
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