在测量过程中参比电极的精确度应高、（）好。
A.重复性能
B.力学性能
C.化学性能
D.电学性能
参考答案：A
He _____ three hours _____ the World Cup yesterday.[ ]
A. took; watch
B. takes; see
C. spends; looking
D. spent; watching
. —I’m sorry. I _________ at you the other day.
—Forget it. I was a bit out of control myself.
A．shouldn’t shout
B．shouldn’t have shouted
C．mustn’t shout
D．mustn’t have shouted
