I wish to inform you that as a result of negligence on the part of the lighter Susan when
A. break
B. broke
C. breaked
D. broken
醋纤膜电泳时,铜蓝蛋白所处的区带是
A. 清蛋白区
B. α1-球蛋白区
C. α2-球蛋白区
D. β-球蛋白区
E. γ-球蛋白区
The pilot {disembarked} our ship yesterday.
A. came
B. left
C. discharged
D. visited