某雄黄矿工人,工龄20年。近来被确诊为肺癌。其接触的致癌物可能是()。
A.铅
B.砷
C.铬
D.锰
E.镍
参考答案:B
My father prefers to stay at home rather than _____ on May Day. [ ]
A. travelled
B. to travel
C. travelling
D. travel
—Thank you for giving me so much help.
—_____. [ ]
A. Don't say so
B. No thanks
C. It doesn't matter
D. That's all right