石器时代切割工具的发展

The response covers both tools and all three views, but its overview could name the visible changes more directly. Tool B is visibly larger, and an approximate length for Tool A can be estimated from the scale; the weaker claims concern craftsmanship, sturdiness and the cause of improved performance.

Ideas are arranged logically with a clear progression from overview to Tool A to Tool B, and cohesive devices such as 'First of all', 'Second' and 'Finally' are used appropriately.

Vocabulary is reasonably varied, including “rudimentary” and “finely sharpened”. However, “grounded” should be “ground” for smoothing a surface, and “chiselling effort” is less precise than a description of visible marks.

A good variety of sentence structures is used with frequent error-free clauses. The singular “view” should be plural in “front and back view”; simple past would also make “had seen vast improvements” more direct. “Dated back” is consistent with the surrounding past-tense description.

The response covers all three views, provides an overview and makes relevant comparisons. The estimate of 7–8 cm for Tool A is reasonable, but the claimed increase of about 5 cm is too large. “Twice as large” needs a stated dimension; it should not automatically be interpreted as twice the length.

Ideas progress logically through overview, front, side, and back views, with cohesive devices such as 'while', 'moreover', and 'in comparison with' used flexibly.

Vocabulary is reasonably varied and precise, including 'tear-drop shape', 'blunt edges', 'primitive', and 'evenly crafted surface', with only minor awkwardness such as 'in regard to'.

A good range of structures is used accurately, including complex comparative and relative clauses, with errors rare and non-impeding.

The response compares both tools and their views, but the overview should identify the main visible changes more specifically. Around 10 cm is a reasonable estimate for Tool B; the error is claiming Tool A has the same length. Claims about manufacturing effort and cutting efficiency also go beyond the visible evidence.

Ideas progress logically across a clear introduction, overview, and staged comparison, with effective use of cohesive devices such as 'therefore' and 'while'.

Vocabulary is varied and generally appropriate, including “blunt edges” and “crafted”. However, “more superior” is redundant because “superior” already expresses comparison; a more specific description of Tool B’s broad rounded base would also clarify its outline.

Sentence structures are varied and mostly accurate, including participle clauses ('with the tip and edges being much sharper'), with only minor errors such as the redundant 'more superior'.

The response describes all three views of each tool, but lacks a clear overview and includes unsupported claims about handling, use and surface flatness. The estimate of about 8 cm for Tool A is defensible against its scale; the 12 cm estimate for Tool B appears high relative to its own scale.

Ideas are organised logically by tool and view, with cohesive devices such as 'However', 'Moreover' and 'In addition' used naturally, though progression is occasionally list-like.

Vocabulary offers useful descriptive terms such as 'rough surface' and 'broad', but 'acute top' is an awkward collocation, and the stick and diamond analogies are less precise than direct descriptions of profiles and facets.

A good range of structures is used, including past passive forms and participle clauses, with errors such as 'it may be easy to hold but it was barely sharp enough' that are minor and rarely impede meaning.

The response covers the front, back and side views and identifies the later tool’s wider outline and slimmer profile. Its overview is rather general, and the claim of greater cutting effectiveness goes beyond what the drawings establish. The 5 cm labels mark reference bars, so an approximate length around 10 cm is not contradicted by those labels.

Ideas progress logically from an overview through dating and overall similarity to view-by-view contrasts, with cohesive devices such as 'however', 'while', and referencing used naturally throughout.

Vocabulary is flexible for describing artefacts, including 'crude implement', 'refined' and 'symmetrical'. Some expressions could be more concise, especially 'is a depiction of' and the repeated chronological framing; 'looks to be' is acceptable here.

A range of complex comparisons, subordinate clauses and participial constructions is handled well. The singular “front and rear view” should be plural because two views are being discussed; this local error does not impede meaning.

The response covers all three views and provides an overview, but the overview could specify the direction of change. Claims about greater effectiveness and particular uses are unsupported. The final paragraph groups the side and back views as significantly larger, overlooking the slimmer side profile; equal 5 cm reference bars do not themselves imply equal tool sizes.

Ideas progress logically through an introduction, overview, and view-by-view comparison, with cohesive devices such as 'whereas', 'in terms of', and 'while' used naturally and flexibly.

Vocabulary is varied, with useful terms such as 'symmetrical' and 'refined'. 'Tear-like' is understandable but less precise than 'teardrop', while 'come in handy' is conversational for this report. Some descriptions of function go beyond the visible evidence.

A good range of complex structures, including relative clauses, concessive 'while' constructions, and modal speculation, is handled with consistent accuracy and only minor slips.