問題詳情

B. Thursday, December 17, dawned and was to go down in history as a day when a great engineering act wasdone. It was a cold day with winds of 22 to 27 miles an hour and puddles of water near the camp were coveredwith ice. The Wrights waited indoors, hoping the winds would stop. But they continued brisk, and at teno’clock in the morning, the brothers decided to attempt a flight. They knew fully the problems and dangers offlying an untried machine in such strong winds.     They also knew that with strong winds, they didn’t really need hills to launch (發射) the machine. The forceof the winds would help the machine take off on the short starting track from the ground. Indeed, the winds werealmost too gusty to launch the machine at all that day. But the brothers guessed that the added dangers in flightwould be balanced by the slower speed in landing caused by flying into strong winds. As a safety precaution,they decided to fly as close to the ground as possible. They were courageous flyers, but never foolhardy     After running the engine and propellers for a few minutes, they were ready to take off. At 10:35 A.M.,Orville, the pilot, lay flat on the lower wing with hips in the cradle. He released the restraining wire and themachine started down the sixty-foot track, traveling slowly into the headwind. Wilbur was able to run alongsideholding the right wing to balance the machine on the track. After a run of forty feet on the track, the machine tookoff. The plane then climbed into the sky, while Orville struggled with the controls to keep it from rising too high in such an irregular, gusty wind. Orville tried to fly smoothly; however, when turning the rudder up or down, theplane turned too far either way and flew up and down. So, after rising about ten feet, the plane suddenly dartedclose to the ground. The first successful flight ended, after having flown 120 feet from the take-off point intwelve seconds and at an airspeed of thirty miles an hour.
49. Wilbur’s job during the take-off was ________.
(A) to run beside the plane
(B) to push the plane
(C) to balance the plane
(D) to hold back the plane

參考答案

答案：A[無官方正解]
難度：非常困難0
統計：A(2),B(2),C(2),D(0),E(0)

內容推薦

內容推薦