When you come into our school yard, you will notice our beautiful school _____by green trees.

A．surrounding

B．surrounded

C．to surround

D．being surrounded

详图与被索引的图样不在同一张图纸内时，则应在详图符号的（）内注明详图编号。

A、下半圆

B、上半圆

C、左半圆

D、右半圆