在苏联领导人中,按时间先后顺序排列,正确的是
①戈尔巴乔夫 ②勃列日涅夫 ③赫鲁晓夫 ④列宁 ⑤斯大林[ ]
A.①②②④⑤
B.⑤①③②④
C.②①④⑤③
D.④⑤③②①
答案:D
He was all wet when he got home because he _____ his umbrella in the underground. [ ]
A. took
B. forgot
C. left
D. brought
可燃物燃烧、缓慢氧化和自燃的相同点是( )
A.都属于氧化反应
B.都属于化合反应
C.都要到达着火点
D.都发光发热