GRE Text Completion: JiJing 1373-GRE填空机经1373题 - 57TU7Z31CMW322LHA

If giant X-ray flares churn circumstellar disks enough to keep newborn planets, such as Earth once was, from spiraling into their suns, it would be an ironic twist on our conception of X-ray flares as ____________. A. dangerous B. predictable C. ancient D. ephemeral E. perilous F. foreseeable