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【单选题】
绵羊的白色对黑色是显性，一只白羊与一只黑羊交配生了一只小黑羊，那么白羊与黑羊的基因组成分别是（ ）
A.
AA与aa
B.
Aa与Aa
C.
AA与Aa
D.
Aa与aa
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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
相关题目：
【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
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