问题
单项选择题
参与体内正常脂肪代谢的是（）
A.苯甲酸
B.山梨酸
C.二氧化硫
D.对羟基苯甲酸乙酯
E.焦亚硫酸钾
答案
参考答案：B
解析：正确答案为B。即参与体内正常脂肪代谢的防腐剂是山梨酸。山梨酸是一种不饱和脂肪酸，在体内直接参加正常脂肪代谢，最后被氧化为二氧化碳和水，几乎没有毒性，是国外使用最多的防腐剂。
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参与体内正常脂肪代谢的是（）
A.苯甲酸
B.山梨酸
C.二氧化硫
D.对羟基苯甲酸乙酯
E.焦亚硫酸钾
参考答案：B
解析：正确答案为B。即参与体内正常脂肪代谢的防腐剂是山梨酸。山梨酸是一种不饱和脂肪酸，在体内直接参加正常脂肪代谢，最后被氧化为二氧化碳和水，几乎没有毒性，是国外使用最多的防腐剂。
Dear Students， I am very happy to be your guest speaker today. It is a great pleasure to visit your school and to meet all of you. I would like to tell you about myself. I have been a news reporter for the past fifteen years. I __46__ this job so I could travel the world，but job has taught me many unforgettable lessons. The work is sometimes __47__. I have seen famines(饥荒)，earthquakes，poorness and death. But I have __48__ seen courage，hope and happiness. In India，I visited a city where there were many homeless children. Some were as young as four years old. They lived in the __49__ and depended on themselves by begging or stealing. But then a wonderful lady called Rosa opened a home for them. Within one year，she was __50__ two hundred children. She clothed them，fed them and taught them. She gave them __51__. __52__ time，I was in Turkey after a terrible earthquake. In one place，I found an old lady whose house was destroyed. Her son was missing and rescue(救援) workers said there was no chance that he was still alive. But the old lady did not __53__ hope. For four days，she moved heavy stones one at a time by herself. She did not stop __54__ she found her son. He was alive. Here in China，I met a young boy who was seriously ill. He had had twenty operationsand spent nearly his whole life in hospital. I thought he would be __55__，but when I met him，his smile was so warm and welcoming. In life，we need good models that we can admire and learn from. When my life is difficult，I try to remember the courage and goodness of these three people.
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