The bow is the oldest projectile-throwing weapon man still uses, and for perhaps 30,000 years its form changed little: a bent stick and a string. When the English archer was the terror of Europe, his legendary longbow could send an arrow about 280 yards. The Turkish bow of the seventeenth century could achieve 600 to 800 yards. Today? The world record, achieved in 1970 on a California salt flat in dead-calm air, is one mile, 101 yards, one foot, eight inches.

Q. Circle the outline which illustrates the structure of the paragraph and underline the topic sentence: ▼ ▲ ♦ ▊.