以下哪几项属于直接突出主体（）
A.体积对比
B.中心和大面积主体
C.黄金点位主体
D.动静对比
参考答案：B, C
若函数f（x）在（1，2）内有一个零点，要使零点的近似值满足精确度为0.01，则对区间（1，2）至少二等分______次．
It is the first time that a developing country _______ the Expo, described as the Olympic Games of economy, science and technology．
A．is hosting
B．has hosted
C．hosts
D．will host
