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【单选题】
HBV基因组含有四个开放读框（ORF），其中最长的是（）。
A.
X区
B.
P区
C.
S区的PreS基因
D.
C区的C基因
E.
C区的PreC基因
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Passage Two In 1997, devotees of home electronics eagerly awaited the DVD player, a new device that could play movies without videotape, and with greater clarity. It caught on even faste...
A.
die economic realities of its practicality
B.
robust economic growth
C.
economic problems of hi-tech companies
D.
ignorance of the technology