A:special
B:peculiar
C:particular
D:unusual
①甲烷 ②烧碱 ③氧气 ④碳酸氢钠 ⑤熟石灰
粮店运来16袋大米,每袋30千克,运来大米的重量比运来面粉重量的2倍少80千克,运来多少千克面粉?
On birthday, they buy flowers__________ birthday presents.