POP广告是一种()。
A、电视广告
B、杂志广告
C、报纸广告
D、售点广告
参考答案:D
下列物质中,属于氧化物的是( )
A.氧化镁
B.食盐
C.酒精
D.空气
Mr. Black is very happy because the clothes made in his factory have never been _____. [ ]
A. popular
B. more popular
C. most popular
D. the most popular