题目内容
The fleet made several expeditions _______ the exploration was stopped.
A. when B. before C. while D. since
B
【解析】略
Butch O’Hare was a fighter pilot. One day his entire squadron（中队）was sent on a mission. In the air after taking off, he realized that someone had 36 to fill up the tank. He would not have enough 37 to complete his flight and get back to his ship. His flight 38 told him to return to the carrier (航空母舰).
As he was returning to the mother 39 , he saw something that turned his blood 40 . A squadron of Japanese planes was speeding their way toward the 41 fleet（舰队）.The fleet was defenseless. He couldn’t 42 his squadron and brings them back in time to save the fleet. Nor could he 43 the fleet of the coming danger.
There was only one thing to do. He 44 force the Japanese away from the fleet. Laying aside all the thoughts of personal 45 , he dove his plane into the formation of Japanese 46 . His plane fired hard as he charged in, attacking one 47 enemy plane and then another. Butch fired at as many planes as possible until all his ammunition（弹药） 48 . Bravely he continued the fighting. He dove at the planes, 49 to hit the enemy planes in hopes of 50 as many enemy planes as possible. 51, the angry Japanese squadron flew away in another 52 . With a great weight taken off his 53 Butch O’Hare and his damaged fighter came back to the carrier.
The film from the camera on his plane told the 54 . It showed Butch’s daring action to 55 his fleet. He had in fact destroyed five enemy aircraft. He became an American hero.
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