GRE Text Completion: JiJing 1373-GRE填空机经1373题 - SA67C27486SC26XRA

If all stars are fiery gas balls like our own sun, and if the principle that the situation of our own solar system is not (i)____________ is (ii)____________, then one might think that many other stars should be surrounded by a retinue of planets and moons. A. obvious B. true C. permanent D. redundant E. special F. tested