俗语“一山不能容二虎”的原因是[ ]
A．环境资源有限
B．被捕食者不能以捕食者为食
C．在每一个环节上都有大量的能量流失
D．ABC3项均是
答案：C
—Why not go on a vacation with us?
—I can't to take the trip because I put all my money into my company. [ ]
A. prefer
B. impress
C. achieve
D. afford
核事故的辐射照射对健康造成的急性影响有哪些？
