痛痛病由哪种环境污染物引起()。
A.铅
B.铬
C.镉
D.锰
E.锌
参考答案:C
Stephen Hawking has expressed his opinion ___ humans might one day be able to make spaceships capable of such speeds that time on board would slow down.
A.that
B.whom
C.which
D.what
根据我国法规,下列哪些功能属于化妆品范畴()。
A.清洁妇女 * * 黏膜
B.除脚臭
C.治疗日光皮炎
D.脱体毛
E.淡化面部斑点