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【单选题】
正常成人白细胞的正常值( )A.
(4.0-10.0)×109/L
B.
(4.0-12.0)×109/L
C.
(4.0-8.0)×109/L
D.
(4.0-15.0)×109/L
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举一反三
【单选题】On which day is Thanksgiving Day? Thanksgiving falls on the _____.
A.
fourth Thursday of November
B.
fourth Tuesday of November
C.
third Thursday of December
D.
third Tuesday of December
【单选题】It was _____ amazing day, but _____ best part was the dancing party
A.
a; /
B.
an; the
C.
/; the
D.
an; a
【单选题】在化合物的紫外吸收光谱中, R 带是指 ( )
A.
n→σ* 跃迁
B.
共轭非封闭体系的 n→π* 跃迁
C.
σ→σ* 跃迁
D.
共轭非封闭体系的 π→ π* 跃迁
【单选题】According to this passage, Valentine's Day is______.
A.
a day on which birds select their mates
B.
a holiday celebrated in honor of Valentine
C.
a holiday celebrated for lovers
D.
a day on which Valentine was killed by the Roman Emperor
【简答题】the day on which a person was born
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