国家对严重污染水环境的落后工艺和设备实行（）制度。
A、鼓励
B、限期整改
C、限制
D、淘汰
参考答案：D
—Where is my watch? I can't find it.
—Don't worry. It must be _________ in your room. [ ]
A. somewhere
B. anywhere
C. everywhere
D. nowhere
骨与关节结核发病率最高的部位是（）
A.肩关节
B.肘关节
C.脊柱
D.髋关节
E.膝关节
