进入炉膛搭设脚手架时，电源线在进入人孔门部分要加（），做好防触电安全措施。
A.漏电保护器
B.橡皮绝缘垫
C.防滑垫圈
D.金属环
参考答案：B
The woman was really _______ because her son was seriously ill. [ ]
A. happy
B. angry
C. worried
D. excited
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