Question

the main, or central, idea of the passage is william kamkwamba managed to build windmills from scrap materials and generate power for his family. how does the detail in bold develop the main idea? when malawi, an agricultural country in southern africa long troubled by poverty, was struck by severe famine in 2002, a widespread lack of electricity and running water hampered its recovery. to lessen his own familys struggles, teenager william kamkwamba decided to build a windmill to generate power. others doubted the viability of his idea; kamkwamba didnt have the finances to buy the proper supplies for such a project. however, kamkwamba persevered. his first windmill, completed when he was just fourteen, was largely built out of scrap materials—including an old bicycle frame and a tractor fan—and generated enough power for only one light bulb. kamkwamba then built a stronger windmill, which powered four bulbs. he went on to build several more windmills, including one for pumping water, allowing his family to use electrical appliances and to irrigate their crops. kamkwambas success garnered international attention and inspired similar projects. it demonstrates the growing success of william kamkwambas windmills. it questions the usefulness of windmills as a large - scale solution. it draws attention to the lack of electricity in remote villages.

Explanation:

The bold - text "He went on to build several more windmills, including one for pumping water, allowing his family to use electrical appliances and to irrigate their crops" shows his increasing achievements with windmills. It builds on the main idea of him building windmills from scrap to generate power by highlighting his growing success.

Answer:

It demonstrates the growing success of William Kamkwamba's windmills.