标签：英语四级试题下载,大学英语四级试题,英语四级真题下载,, 2017年12月英语四级完形填空模拟试题(二),
20xx年12月英语四级完形填空模拟试题（二）
The rocket engine， with its steady roar like that of a waterfall or a thunderstorm， is an impressive symbol of the new space age.Rocket engines have 1 powerful enough to shoot astronauts 2 the earth‘s gravitational pull and 3 them on the moon.We have now be， 大小：8.29 MB