问答题 《复合题被拆开情况》 Wilbur and Orville Wright were the two youngest sons of Bishop Milton Wright, Wilbur was born on a farm near Millville and Orville was born in August, in the house the family would come to occupy for more than 40 years in Dayton. Orville would discover in later years that his and Wilbur’s first interests in flight began when they were children, with powered rubber-band-helicopter toys that their father would bring home for them from trips around the country. Orville and Wilbur would build duplicates of these toys and bounce them off the ceiling. They were just crazy about these things for the reasons that they did not yet understand. Many great inventions are greeted with ridicule and disbelief. The invention of the airplane was no exception. Although many people who heard about the first powered flight on December 17, 1903, were excited and impressed, others reacted with peals of laughter. The idea of flying an aircraft was repulsive to some people. Such people called Wilbur and Orville Wright, the inventors of the first flying machine, impulsive fools. Negative reactions, however, did not stop the Wrights. Impelled by their desire to succeed, they continued their experiments in aviation.
【正确答案】The inability to obtain enough lift power for the gliders.
【答案解析】文章第四段最后一句话提到,兄弟俩无法为滑翔机获得足够的升力,几乎让他们放弃了努力。本题问的就是莱特兄弟几乎放弃努力的原因,由此句可知本题答案。