美国家庭按年收入分布情况

The response covers all five categories and offers an overview, but its claim of a gradual ascent in the highest-income group overlooks the visible dip in 2011. It also infers upward mobility from group counts and exaggerates lower-band volatility; the final paragraph repeats previously reported data.

The response is logically organised with a clear progression from overview to category details, though cohesion devices are at times heavy or mechanical, and the final paragraph's redundancy weakens the overall flow.

A wide range of less common vocabulary is attempted, but the frequency of inflated or imprecise items such as 'unflappable consistency', 'transient zeniths', and 'ascendant trajectory' produces occasional inaccuracy in word choice and collocation.

A wide range of complex structures, including apposition, participle clauses, and varied subordination, is used with generally strong control and only occasional awkward or overextended constructions.

The response presents a clear overview, covers all five income categories across the three years, and reports largely accurate figures, though statements such as calling the $100,000 group a 'majority' and the $75,000–$99,999 group 'negligible' are unsupported by the chart.

Ideas are logically sequenced from an overview through low, middle, and high income groups, with cohesive devices such as 'Overall', 'In contrast', and 'Notably' used effectively.

Vocabulary is flexible and precise for describing trends and comparisons, including 'upward trajectory', 'moderate growth', and 'remained consistent', with only minor imprecision in wording like 'negligible'.

A wide range of complex structures, including participle phrases and concessive clauses, is used with consistent accuracy and control throughout the response.

The response presents a clear overview of the dominant trends, covers all five income brackets across all three years, and the reported figures match the chart closely with well-chosen comparisons.

The information is logically organised by income level with effective use of cohesive devices such as 'Overall', 'However', and 'In contrast', though progression within paragraphs is at times mechanical.

There is a good range of topic-appropriate vocabulary, including 'bracket', 'peaking', 'declined moderately', and 'recovered', used with reasonable precision despite occasional looseness such as 'stood at'.

A variety of complex structures, including relative clauses and participle constructions, is used flexibly and accurately, with only minor slips such as the spacing error before a full stop.

The report covers all five income bands and supports the main comparisons with broadly accurate estimates. However, the overview describes steady growth in the highest-income group despite its fall in 2011, contradicting the detailed paragraph. Some smaller changes are summarised without their sequence.

The response progresses clearly from an overview to the largest changes and then the more stable groups. Paragraphing and references make the comparisons easy to follow. The description of the middle bands as far more stable slightly overstates the contrast.

Vocabulary is varied and precise enough to describe levels, changes and comparisons, including dipped, easing slightly and held almost constant. Income categories are referenced naturally, with little unnecessary repetition. A few broad comparative expressions could be made more exact.

A wide range of sentence structures is used accurately, including relative clauses, participial phrases and comparisons. Past tenses are consistent and punctuation supports the longer sentences. Most sentences are error-free, with no clear recurring grammatical weakness.