检查轴承内外钢圈、滚柱不得有锈斑、剥皮、麻点、凹坑等缺陷，弹夹完整，不合要求应予（）
A.修理
B.更换
C.焊补
D.铜焊
参考答案：B
关心教好每一堂课，关心班级大小、时间压力等问题，说明教师成长进入了（）。
A.关注情境阶段
B.关注自我阶段
C.关注他人阶段
D.关注学生阶段
Li Lei ______ in the classroom now. But he______ a moment ago. He ______ to the teacher's office. [ ]
A. is, wasn't, has gone
B. isn't, was, went
C. is, wasn't, has been
D. isn't, was, has gone
