单项选择题

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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单项选择题
A．The doctor won’ t see her tomorrow.B．The doctor is busy now.C．The doctor is busy .all day today.D．The doctor will see her today.
A．The doctor won’ t see her tomorrow.
B．The doctor is busy now.
C．The doctor is busy .all day today.
D．The doctor will see her today.
单项选择题
A．Once a week.B．Twice a week.C．Once every three weeks.D．Once every two weeks.
A．Once a week.
B．Twice a week.
C．Once every three weeks.
D．Once every two weeks.
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