Medium well means the degree of the ripeness is___ percent()
A. 40
B. 50
C. 90
D. 70 or 80
弹性力学的任务与下列哪门课程相同()
A. 理论力学
B. 材料力学
C. 结构力学
D. 流体力学
During the English news clip, how many flights has been cancelled in Shenzhen airport yesterday()
A. 100
B. 120
C. 200
D. 220