All the students at school are required to lectures by the experts on howto save themselv

All the students at school are required to lectures by the experts on howto save themselves when accidents occur, such as fires, a gas leak and so on.
A. join in
B. take part in
C. attend
D. participate in

A. join inB. take part in(答案→)C. attendD. participate in解析：当作参加讲时join和 take part in是相同的，都表示加入某种组织、政党、俱乐部等团体（join a club.成为俱乐部的会员） 但是用法上，take part in 不可以用被动语态。attend 是出席的意思，表示在某种比较正式的场合出现。例如，上课，会议等。 join in +(加入一个组织)join in the organization join （join us/参与*一起*的活动)join us to watch TV take part in (参加一项活动)Take part in the sports meeting.Lecture是演讲的意思，因此选C 最合适。

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