Our school have planted different kinds of trees and flowers, _____ a beautiful and peaceful  

environment for students..

A．create

B．creating

C．to create

D．created

SE序列各加权像，均为低信号的病变是（）

A.肝脏淋巴瘤

B.孤立性坏死结节

C.原发性肝癌

D.肝脏血管瘤

E.转移性肝肿瘤