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【单选题】
A 2-year-old boy is exhibiting developmental delay and has started to bite his lips and fingers. Orange-colored “ sand ” is found in his diapers. This child has an inability to metabolize which one of the following molecules?A.
Uric acid
B.
Thymine
C.
Adenine
D.
Uracil
E.
Hypoxanthine
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【简答题】Rough ER has ( ), but smooth ER does not.
【单选题】在游览某景点时,有游客走失,经过认真寻找时无果后,导游应( )。
A.
向请全陪去找，自己带领其他游客放慢速度继续游览。
B.
领队与游客原地等待，自己去找
C.
地陪与领队分头去找
D.
全陪与团员分头去找
【简答题】某工作在放大状态的三极管，当基极电流IB由60μA降低到40μA时，集电极电流IC 由2.3mA降低到1.5mA，则此三极管的动态电流放大系数β为（）。
【简答题】A solar car is an electric car powered by solar electricity.
【单选题】-- Hey! Do you know Bulls’ Derrick Rose becomes the youngest NBA MVP? -- Er… but what does MVP________?
A.
call for
B.
ask for
C.
prepare for
D.
stand for
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