VI. Read the passage and answer the question: How has the classical drawbridge been improved?

The drawbridge or bascule, originally used for protection against intruders, has been turned into a means for allowing the passage of water traffic. The classic drawbridge, in which the bridge leaf is hoisted by rope or chain, has been improved by the development of pears and counterweights. Design variations include leaves that roll back on tracks, bridges whose entire span is lifted vertically by cables run over tall towers to counterweights and bridges that swing on a central turntable.

VII. Make the precis of the text