2. 外语
  3. For centuries man dreamed of achieving vertical flight. Leonardo da Vinci conceived the first mechanical apparatus(仪器), which co

For centuries man dreamed of achieving vertical flight. Leonardo da Vinci conceived the first mechanical apparatus(仪器), which co

admin2014-12-31  44
问题     For centuries man dreamed of achieving vertical flight. Leonardo da Vinci conceived the first mechanical apparatus(仪器), which could carry a man【C1】______up, but this was only a design and was never tested.
    The ancient dream was finally realized in 1940 when a Russian aeronautical(航空学的)【C2】______, piloted a strange-looking craft of steel tubing with a rotating fan on top. It rose awkwardly and vertically into the air from a standing start, hovered a few feet above the ground, went sideways and backwards, and then settled back to earth. That【C3】______was called a helicopter.
    Imaginations were fired. People【C4】______that vertical flight transports would carry millions of passengers as do the airliners of today. Such fantastic expectations were not【C5】______. It excels in military missions,【C6】______troops, guns and strategic instruments where other aircraft cannot go. Corporations use them as airborne offices; many urban areas use them in police work, construction and logging companies【C7】______them in various advantageous ways. Engineers use them for site selection and surveying, and oil companies use them as the best way to make offshore and remote work stations accessible to crews and supplies. Any urgent【C8】______to a hard-to-get-to place is a likely task for a helicopter. Among their other【C9】______of uses, they deliver people across town, fly to and from airports,【C10】______in rescue work, and aid in the search for missing or wanted persons. With all these functions, the helicopter has now become an extremely versatile machine.
A)recognize B)vehicle C)caustic D)anticipated
E)actually F)fulfilled G)employ H)carrying
I)mission J)straight K)helpless L)engineer
M)assist N)balancing O)abundance
【C3】
选项
答案B
解析 这里需要名词作主语，且此名词可以被叫作直升机，可选的只有vehicle，意为“交通工具”。
转载请注明原文地址:https://kaotiyun.com/show/Shq7777K
0

大学英语四级

相关试题推荐
随机试题
最新回复(0)