鲍温病发展为侵袭性鳞癌风险最高的部位是（）。
A.口腔
B.女阴
C.龟头
D.肛周
E.泌 * *
参考答案：D
_____ trees were cut off. And many birds lost their home. [ ]
A. Thousand of
B. Thousands of
C. Two thousands
D. Two-thousand
在狭窄场所如锅炉，金属容器，管道等应使用（）类工具。
A、I
B、II
C、III
