在“饮食伺釁，成肠胃之眚”中，“眚”之义为（）
A.目疾
B.病患
C.灾难
D.罪过
参考答案：B
— What made Alice so upset?
— ________. [ ]
A. Peter's leaving without saying goodbye
B. Peter left without saying goodbye
C. Peter was leaving without saying goodbye
D. Peter had left without saying goodbye
仅在三自由度陀螺仪上施加重力控制力矩，其主轴的运动轨迹是（）。
A.圆
B.椭圆
C.收敛螺旋线
D.指数衰减曲线
