This building is ________ one in our hometown and it has been there for 70 years.
A:old
B:older
C:the oldest
物质的分类非常重要。下列按酸、碱、盐的顺序排列的是()
读“亚洲在世界的位置图”,完成下面小题
Look at the light, it's yellow.
2×(-12)的结果是( )