问题
单项选择题 A1型题
蛋白质在280nm波长处有最大光吸收，是由下列哪种结构引起的（）
A.组氨酸的咪唑基
B.丝氨酸的羟基
C.半胱氨酸的-SH基
D.苯丙氨酸的苯环
E.谷氨酸的-COOH基
答案
参考答案：D
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蛋白质在280nm波长处有最大光吸收，是由下列哪种结构引起的（）
A.组氨酸的咪唑基
B.丝氨酸的羟基
C.半胱氨酸的-SH基
D.苯丙氨酸的苯环
E.谷氨酸的-COOH基
参考答案：D
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| Mrs Green opened the door so hard that the door nearly broke. Then she looked 1 the window at her neighbour across the yard.（院子）" She is in my __ 2__ again.” Those are my strawberries(草莓), not__ 3 __. Maybe I should call the police.” Her friend, Alice was sitting at the table__ 4__ a cup of coffee in her hands. “ You want to call the police because she picks your strawberries?” she asked. " Of course,” Mrs Green answered __5__. “ What would you do if your neighbour walked into your yard__6__ your permission(允许) and picked your strawberries?” " I would say, better her than bees(蜜蜂)." " The bees don't take my strawberries.” " But the ___7__ do,” Alice continued. “ That old lady only picks a few strawberries every year, and the only ones she picks are those you leave to the birds. Why __8__ you pick some of your good strawberries and give __9__ to her?” " Are you crazy? What are you thinking?” " I don't think so. Do you remember when you were ill in __10__ last year? She went to see you with some chicken soup. If you give her the strawberries, you can tell her you still __11__that.” Mrs Green was shocked(震惊). She almost __12__that little kindness because she was too angry. Then she __13__ a basket of good strawberries and went to her __14__. Through the window, Alice could see that anger on Mrs Green's face changed into a bright __15__. | ||||
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