题目

Here _____ two pencils. A. are                 B. Is           C. am              D. Be 答案：A14．$\sqrt{5}$的相反数是（　　）A．$\sqrt{5}$B．-$\sqrt{5}$C．-$\frac{1}{{\sqrt{5}}}$D．$\frac{1}{{\sqrt{5}}}$