在低压设备上停电作业时，至少有1名作业人员的安全等级不低于（）级。
A.二
B.三
C.四
参考答案：A
一项工程甲单独做3天完成了，乙单独做15天完成，甲乙合作2天后，余下的工作乙还要做几天？
One of the collectors collected some seeds from a tree that had ________ him. [ ]
A. interest in
B. appealed to
C. been attracted
D. drew attention of
