问题
选择题
My sister has _______ e-dog and his name is Huanhuan. [ ]
A. a
B. an
C. the
D. 不填
答案
答案：B
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My sister has _______ e-dog and his name is Huanhuan. [ ]
A. a
B. an
C. the
D. 不填
答案：B
的化学名称是2-乙基丁烷 
(b)CH2=CH2 (c)CH3CH(CH3)CH2OH (d)
(g)CH3CH(CH3)CH2Br