多项选择题

高空作业级别划分为（） A. 一级高空作业 B. 二级高空作业 C. 三级高空作业 D. 特级高空作业

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单项选择题

In the 1960s, ________.
A、students were more interested in taking drugs than in protesting
B、California had become very rich because of its political radicalism
C、the governor of California felt that Berkeley University students were right to protest
D、there were students at Berkeley who believed that political change was necessary

多项选择题

女导游标准蹲姿有以下几种（）。
A、弯腰式
B、撅臀式
C、并拢式
D、高低式
E、交叉式