A.乙烯可以用来做果实催熟剂
B.氨常用来做制冷剂
C.氧化铁常用作红色油漆和涂料
D.浓硫酸可用来干燥某些气体(不挥发性)
答案:D
产生于战国中期的诸子散文是()。
Do you dress differently because of what you see in advertisements or buy things you might not ________buy?
A.besides
B.therefore
C.furthermore
D.otherwise