【单选题】He should ( ) what he's good at, and no switch to something he knows nothing about.
【单选题】硬盘属于紧密仪器,在移动、安装或维修过程中,很容易受到物理损坏,但是下面描述()现象不能断定硬盘存在物理损伤。
【单选题】How much does the man know about China's tea culture?
A.
He knows much about it.
B.
He knows nothing about it.
C.
He has a limited knowledge of it.