问题
单项选择题
The primordial fireball would have been a dense roiling stew of radiation and elementary particles condensing out of the ______ energy, annihilating each other, recondensing, then colliding and disappearing all over again.
A. colossal
B. audacious
C. ambient
D. autonomous
答案
参考答案：A
解析： 本题中，A项的“colossal巨大的，庞大的”符合题意，如：a colossal monument(巨大的纪念碑)。其他三项“audacious大胆的，鲁莽的；ambient周围的；autonomous自治的”都不正确。