ROM主要用来存放计算机系统的程序和数据。( )
参考答案：对
--Why did you come a long way round?---I was afraid ___ near the fierce dog because I was afraid ___.
A．of walking; to be bitten
B．to walk; of being bitten
C．to walk; to be bitten
D．of walking; of being bitten
心脏原发性肿瘤最常见的是（）
A.心脏黏液瘤
B.脂肪瘤
C.血管瘤
D.纤维瘤
E.错构瘤
