“非集合概念”这个概念的属概念是______。
参考答案:概念
—Does she like playing ______ guitar?
—Yes. And she likes playing ______ soccer, too. [ ]
A the; /
B. /; /
C. the; the
一个数是由3个十亿、9个千万、8个百万,6个万,2个百,7个十组成,这个数是( ), 省略亿后面的尾数约( )亿。