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举一反三
【单选题】菌以转化方式进行基因转移时有以下特性：
A.
大量供体细胞的基因被转移
B.
包含有F质粒参加
C.
依靠噬菌体感染受体细胞
D.
可通过从供体细胞中提取DNA片段来完成
【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