题干
The A(H1N1) influenza (甲流)was spreading rapidly across the country but it remained under______ control, _______official with the Ministry of Health said in Beijing on Sunday．
A：不填；a
B：the; a
C：不填；不填
D：the; the
答案(点此获取答案解析）
A
④CH3—CH===CH—CN，其中可用于合成结构简式
的高分子材料的正确组合为( )