Question

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

Answer 1

B

试题分析：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.