反义词的作用有()
A.有助于揭示事物矛盾,形成鲜明对照
B.有助于确定多义词的不同意义
C.有助于确定同义词的细微差别
D.有助于构成反语
参考答案:A, B, C, D
The student’s behavior cost the teacher a steepless night . He never thought his student ______ computer games for a whole class .
A.played
B.was playing
C.had been playing
D.would play
固体废弃物的危害有哪些?