单项选择题

A sequence of DNA B. Cells. C. Proteins. D. All of the above.
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单项选择题
A．Tennis shoes.B．Some clothes.C．Nothing yetD．Music records.
A．Tennis shoes.
B．Some clothes.
C．Nothing yet
D．Music records.
单项选择题
A．Individual humans share 90 percent of their DNAB．Individual humans share 95 percent of their DNAC．Individual humans share 99.9 percent of their DNAD．Individual humans share 99 percent of their DNA
A．Individual humans share 90 percent of their DNA
B．Individual humans share 95 percent of their DNA
C．Individual humans share 99.9 percent of their DNA
D．Individual humans share 99 percent of their DNA
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