单项选择。
Danny can play basketball .[ ]
A. easy
B. easily
C. easier
D. easiest
答案:B
It's not necessary for you to be ______ about others' business.[ ]
A. concern
B. concern yourself
C. concerning
D. concerned
基金管理人与托管人履行各自的权利、义务所建立的是()的运行机制。
A.相互联系
B.相互促进
C.相互竞争
D.相互制衡