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【单选题】
核酸是生物体在生命活动过程中起着极重要作用的一种基本物质。核苷酸是组成核酸的基本结构单位，核苷酸由碱基（嘌呤或嘧啶）、磷酸及核糖（或脱氧核糖）组成。嘌呤核苷酸合成和代谢中最常见的代谢紊乱是高尿酸血症并由此导致痛风。骨髓增生性疾病导致高尿酸血症的原因是（）A.
PRPP合成酶亢进
B.
HGPRT缺乏
C.
嘌呤分解增加
D.
糖尿病肾病
E.
葡萄糖-6-磷酸酶缺乏或不足
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举一反三
【单选题】'You are very selfish. It's high time you__________ that you are not the most important person in the world.' Edgar said to his boss angrily.
A.
realized
B.
have realized
C.
realize
D.
should realize
【单选题】The senior three students in our school received word last week _____ some excellent students had been admitted to Peking University without taking the exam. [ ]
A.
that
B.
which
C.
how
D.
what
【简答题】铊污染典型的临床表现?
【简答题】Input the height of the three students, find the average height of the three students.
【单选题】I've got a very ______ schedule today so I can't see you until tomorrow.
A.
serious
B.
big
C.
tough
D.
tight
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