带传动的传动型式有（）传动。
A.开口
B.交叉
C.半交叉
D.张紧轮
参考答案：A, B, C, D
—Look! There is a big bag _______ the road.
—You're right. It's too dangerous. Let's move it away. [ ]
A. taking up
B. taking away
C. taking off
D. taking out
三段论第二格的两个前提都是肯定命题时，该三段论必然要犯的错误是（）.
A.四词项错误
B.中项两次不周延
C.小项扩大
D.大项扩大
