CELPIP Reading Part 3Reading for Information Practice

A. A pencil leaves a mark when thin layers of graphite detach from its core and cling to fibres in paper. Graphite is a form of carbon whose layered structure allows these tiny particles to slide away under pressure. Despite the common name lead, modern pencil cores do not contain the metallic element used in older writing tools. The darkness and feel of a mark depend on both the core mixture and the surface receiving it. This combination helps explain why graphite marks and the origin of the pencil core cannot be understood from one feature alone or from one brief observation.

B. Manufacturers grind graphite and clay into fine powders and combine them with water to form a workable paste. More graphite generally produces a darker, softer core, while more clay creates a harder, lighter grade. The paste is pressed through narrow openings, cut into lengths, dried, and fired to strengthen the slender rods. Wax or oil may then enter the pores, changing how smoothly the finished core moves across paper. For manufacture and design of graphite pencils, relationships among these features matter because a change in one may influence several others within the same setting over time.

C. Straight-grained wood is cut into thin slats and grooved to hold several graphite cores side by side. A second grooved slat is glued above the first, enclosing every core within a long wooden sandwich. Machines separate the sandwich into individual pencils and shape their round, hexagonal, or other profiles. Paint and printed markings protect the wood and identify the manufacturer or hardness grade. Viewed together, details about wooden casing and assembly connect visible characteristics with processes that are less immediately obvious to an ordinary observer at first.

D. Sharpening exposes fresh graphite while forming wood around it into a support for the brittle core. An attached eraser is convenient but remains a separate material joined by a metal or paper band. Manufacturers can use responsibly managed wood and recover graphite or sawdust from production waste. Mechanical pencils avoid repeated wooden sharpening, although they require precisely sized replacement cores and a holding mechanism. Within manufacture and design of graphite pencils, the result is a system in which structure, timing, and local conditions remain closely connected throughout continuing development.

E. Not given in any of the above paragraphs.