只有一个意义的短语叫（），不止一个意义的短语叫（）。
参考答案：单义短语；多义短语
-Hi,Tracy,you look tired.
-I am tired.I ____ the living room all day. [ ]
A. painted
B. had painted
C. have been painting
D. have painted
焊接作业的危害有（）。
A.焊接作业的高温、粉尘及光幅射危害
B.触电
C.焊接作业中燃烧爆炸
D.焊接作业中的高处坠落
