Beihai Park is     a beautiful place that      many people come to visit it every day.

A．such; so

B．so; such

C．such; such

D．so; so

深龋备洞可以不必达到的要求是

A．底平壁直

B．去尽腐质

C．保护牙髓

D．洞缘线圆钝

E．尽量保留健康牙体组织