http://www.qinxue6.com提供
2016英语四级完型填空模拟训练(二十四)免费下载，
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 become
4 space.2016英语四级完型填空模拟训练(二十四)
标签：
