不定项选择

目前我国城市规模划分标准以户籍人口为统计口径。（）

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单项选择题

The reason for gingival atrophy due to the gingival weakness resulted from the lack of massage from food is: ( )

A．The crown has no convexity.
B．The convexity of the crown is too much.
C．The convexity of the crown is too little.
D．The convexity of the crown is normal.
E．The shape of the crown is irregular.

单项选择题

“数以亿计”的英文表达是( )。

A．hundreds of millions of
B．tens of millions of
C．millions of
D．billions of