问题补充：
People complain that the price of the apartment is getting.
A. lower and lower
B. higher and higher
C. cheaper and cheaper
D. more and more expensive
答案：
A. lower and lower
(答案→)B. higher and higher
C. cheaper and cheaper
D. more and more expensive
解析：本题考查形容词的比较级。比较级连用表示越来越……的含义，本题的含义为人们抱怨公寓的价格变得越来越高了。higher and higher表示越来越高的含义，符合本题含义；而lower and lower表示越来越低的含义，cheaper and cheaper表示越来越便宜的含义，more and more expensive表示越来越贵的含义，后三者与题意不符，故本题选B。
