东西论贵贱：意思是说具体的商、物品都可以用expensive和cheap来修饰；
价格论高低：意思是说谈到具体的价格price，就必须用high和low来修饰了。
价格的高或低 = 东西的贵或贱。
核心原理如下：
l price的英文词条解释：the amount of money that you have to pay for sth
l 英语里的expensive以及cheap后面必须搭配具体的东西，比如expensive clothes，cheap shoes；不可以搭配number/amount这个抽象概念.
l 因为price也是一个number/amount，所以expensive以及cheap不能形容price。
l 我们可以说：expensive clothes
l 我们不能说：expensive price
搭配词组：
a high/reasonable/low price 或者rising / falling / full prices
（）1. - Why doesn't Lucy buy the dress?
- She thinks the price is too________.
A.tall B. high C.small
答案：B
解析：price的修饰词只能用high或low。
（）2. The house price of Beijing is higher than that of Harbin.
A.higher B. more expensive C. cheaper
答案：A
解析：price的修饰词只能用high或low。本题是比较级，就是higher。
（）3. The high price is a major hindrance to potential buyers.
A.high B. expensive C. cheap
答案：A
解析：price的修饰词只能用high或low。
（）4. Meat is bringing a high price this week.
A.high B. expensive C. cheap
答案：A
解析：price的修饰词只能用high或low。
（）5. The price is too high for the good.
A.high B. expensive C. cheap
答案：A
解析：price的修饰词只能用high或low。
（）6. The price for these goods was often extremely high.
A.high B. expensive C. cheap
答案：A
解析：price的修饰词只能用high或low。
（）7. I bought this watch at a low price.
A.cheap B. expensive C. low
答案：C
解析：price的修饰词只能用high或low。
（）8. Bill sold his stamps at a low price, so he lost much money.
A.high B. low C. cheap
答案：B
解析：price的修饰词只能用high或low。根据后半句损失钱了，所以价格是低的。
（）9. The company offers excellent service at a low price. It is a really good company.
A.high B. low C. cheap
答案：B
解析：price的修饰词只能用high或low。根据后半句“真是个好公司”，因此物美价廉，选择low。
（）10. If they are willing to sell us steel at a low price, there is no telling what they might do next.
A.low B. expensive C. cheap
答案：A
解析：price的修饰词只能用high或low。
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