If industrial pollution continues to deplete the ozone layer, the resulting increase in ultraviolet radiation will endanger human helth, causing a rise the incidence of skin cancer and eye disease, and perhaps even threatening global ecological syste.
A. and perhaps even threatening
B. and may even threaten
C. and even a possible threat to
D. as well as possibly threatening
E. as well as a possible threat to
需要解释， answer is Ｂ, 最迷惑于 Ａ，Ｂ中 | 
