问题
单项选择题
能形成-碳单位的氨基酸为（）
A.丝氨酸
B.天冬氨酸
C.苏氨酸
D.缬氨酸
E.苯丙氨酸
答案
参考答案：A
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能形成-碳单位的氨基酸为（）
A.丝氨酸
B.天冬氨酸
C.苏氨酸
D.缬氨酸
E.苯丙氨酸
参考答案：A
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| Mrs Smith is thirty-eight. She has two 1 . She looks very smart with fair hair and always tries to keep thin. She hopes 2 young and never eats 3 meat. She doesn't want others to know how 4 she is. Mrs Smith works in an office next to her home. It was raining heavily one morning. The head of 5 office went out to join a meeting. The woman had 6 to do. So she began to talk with Mr Zhang about her birthday party. Mr Zhang is an old man 7 glasses. He works in the same office. "My family bought me a fresh cake," said the woman, "It smelled very 8 ! And I put nineteen candles on it- one for a year!" "Really?" asked Mr Zhang. He 9 very surprised. "How did you burn (点着) 10 of the ends (两端) at the same time?" | |||
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