— Does Mr. Li know giraffes?
— Yes, .
A:he does
B:she does
C:him does
①abc>0;②该抛物线的对称轴在x=﹣1的右侧;③关于x的方程ax2+bx+c+1=0无实数根;④ a+b+cb ≥2.其中,正确结论的个数为( )
—Do you live in this city?— _____
炭雕是一种集观赏、空气净化于一体的工艺品(如图),其主要成分是木炭.下列说法中错误的是( )