...and the permission for bright students to progress according to their ability.

　　　　③ It may seem a good idea to try to sell your house. But there are many pitfalls: improper pricing (too high or too low); guessing where to place the ads; showing your house to people who may or may not be interested; and finally, knowing who may or may not be qualified to buy.

　　　　首先，这句里提到四个陷阱，其中三个用动名词形式，另一个却用形容词+动名词（improper pricing），有点格格不入，必须稍作调整：pricing too high or too low。此外，这段话有些?唆，应该进一步修饰：

　　　　...setting prices too high or too low; guessing where to place the ads; showing your house to the interest group; and knowing the eligible buyers.

　　　　句子成分不对应，不平衡的例子，比比皆是。现在请看看下列这几个句子，并辨其正误：

　　　　④a. Helen is tall, with big eyes, and has a pleasant face.

　　　　　b. Helen is tall, big-eyed and pleasant.

　　　　⑤a. Betty has long hair and was very graceful.

　　　　　b. Betty has both long hair and great grace.

　　　　　c. Betty is long-haired as well as graceful.

　　　　⑥a. Today, a secretary must be very pleasant in appearance and has unusual intelligence.

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