四个国家2000至2004年日石油产量

The response covers all four countries and reports useful endpoint figures accurately. The overview overstates the continuity of the rankings: Nigeria leads in 2004, when Chad and Somalia tie. Nigeria rises overall despite an early decline, and production capability is not measured.

Ideas progress logically from overview to detail, with larger producers grouped together and smaller producers compared separately. The connector introducing Congo’s decline is faulty, while the stacked participles in the final sentence make the sequence less direct.

Vocabulary is flexible and appropriate for describing data, with items like 'fluctuated', 'gradually decreased', and 'sharply increasing', showing good range with only minor imprecision such as 'boosted its production capability'.

A wide range of structures, including participle phrases and complex sentences, is used with generally good control, and occasional errors remain non-impeding.

The response covers the main trends and accurately compares the leading countries and the final tie. Somalia’s more-than-twofold rise is valid for 2003–2004, though the baseline could be explicit. Chad’s growth-rate claim needs a stated measure because its 2000 output is zero.

Ideas are organised into logical paragraphs with a clear progression from overview to country comparisons, using cohesive devices naturally throughout.

Vocabulary is varied, including “switch in ranks” and “surged”, but “outnumbered” is unsuitable for the oil volume being compared. “Insignificant” could also be replaced with a more explicit comparison of production levels.

A range of complex structures is used with good control, including inversion ('not until 2003 did this country record...') and accurate relative and participle constructions.

The response covers all four countries with accurate figures and contrasting trends. Its broad ranking needs the 2004 exceptions: Nigeria overtakes Congo, while Chad and Somalia tie. Somalia’s growth is more sustained than Chad’s, though its especially large final-year increase could be highlighted.

Information is organised into logical paragraph groupings with effective use of referencing and cohesive devices such as on the other hand and meanwhile, giving clear progression throughout.

Vocabulary is flexible and precise for describing trends, including phrases like witnessed increases, sustained and incremental, and fluctuates, with only slightly unusual register in quotidian.

Complex comparative and contrastive structures are generally controlled. The final paragraph would read more smoothly with consistent past-tense reporting, correctly placed punctuation around “meanwhile”, and a coordinated verb instead of “to increase” for the subsequent recovery.