—In order to give more chances to the talented students, an dancing competition ______ soon.
—That's great!
A:will be held
B:is held
C:was held
有下述命题①若f(a)·f(b)<0,则函数f(x)在(a,b)内必有零点;②当a>1时,总存在x0∈R,当X>x0时,总有ax>xn>logax;③函数y=1,x∈R是幂函数;④若A⊂≠B,则Card(A)<Card(B) 其中真命题的个数是( )
在划横线处填写正确的读音。
____
嘴巴
拱出
口袋
鼻子