单项选择题

A．In his early twenties.
B．In his late twenties.
C．In his early thirties.
D．In his late thirties.
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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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vacation
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