题目内容:
Whichofthefollowingisthepossibleriskinusingnano—materialsmentionedinthepassage?
A.Theymaycausesomedamagetothebodycell B.Theyareharmfulmaterialsthemselve
C.Theymaystoreinthebod
D.Theymaybehavedifferentlyinthebodyandtheenvironmen
参考答案:
答案解析: