Good news! The price of all those second-hand goods is ________ before.
A．30% as lower as
B．30% lower than
C．lower 30% than
D．as 30% low as
答案：B
题目分析：倍数的表达：倍数 + as + 形容词或副词的原级 + as + 其他；倍数 + 形容词（或副词）的比较级 + than + 其他；倍数 + the size / height / length / width. etc. + of + 其他。句意：好消息！这些所有的二手商品的价格比之前低30%。
点评：掌握倍数问题的固定结构：比如表示A是B的几倍长（宽，高，大，重等）” ：
1.“A + be + 倍数 + as + 计量形容词原级 + as + B”。如： This tree is three times as tall as that one. His father is twice as old as he.
2.“A + be + 倍数 + 计量形容词比较级 + than + B ”。如： The dictionary is exactly five times more expensive than that one.
3.“A + be + 倍数 + the + 计量名词 + of + B ”。如： The newly broadened square id four times the size of the previous one.
4.“The + 计量名词 + of + A + be + 倍数 + that + of + B ”如： The size of the newly broadened square is four times that of the previous one.