This can help to ______ something that the students may not. have comprehended.
A. signify
B. specify
C. testify
D. clarify
Americans are highly ______ , and therefore may find it difficult to become deeply involved with others.
A. moving
B. mobile
C. movable
D. motional
We were frightened by the ______ of the crowd.
A. hospitality
B. honesty
C. humanity
D. hostility
刨的刨刃平面应磨成一定的形状,即形成( )为正确。
A. 直线形
B. 凹线圆弧形
C. 凸线圆弧形
D. 斜线形