我国职业病名单中，列入职业肿瘤，可引起膀胱癌的毒物是
A．联苯胺B．氯甲醚C．石棉D．砷E．焦炉逸散物
参考答案：A
—Is that Jack speaking?
—Sorry, he _______ in. He _______ back in half an hour. [ ]
A. isn't; will be
B. wasn't; will
C. isn't; is
D. wasn't; was
再投资退税优惠中所适用的退税率有( )。
A．40%
B．60%
C．33%
D．100%
