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【单选题】
关于构成蛋白质的氨基酸的叙述，下列哪正确的？（）A.
除Gly外均为D构型
B.
除Gly外均为L构型
C.
只含有a-氨基和a-羧基
D.
均有极性侧链
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【简答题】2/什么叫做作用效应 ? 什么叫做结构抗力 ?
【单选题】听力原文：W: Finding this china cabinet was a real stroke of luck. Because of the scratch on the side, the dealer charged me $50 less than the regular price. M: You were very lucky, and with a little polis...
A.
He thinks it is a pity that there is a flaw on it.
B.
He thinks it is a good bargain but it could be much cheaper.
C.
He thinks it is a real bargain because the flaw is hardly noticeable.
D.
He thinks the woman should show it to her friends.
【单选题】It was a stroke of luck that she had always been able to write with ______ hand, which sometimes helped her a lot.
A.
both
B.
each
C.
every
D.
either
【简答题】What a stroke of luck I had!
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