特种作业人员要经过（）合格取得操作证，才允许上岗。
A、文化考试
B、安全专业技术培训考试
C、体能测试
D、驾驶培训
参考答案：B
该图中的四种大气运动形式，错误的是
单位：百帕
The number of people invited __________fifty, but a number of them__________ absent for different reasons.
A．were; was
B．was; was
C．was; were
D．were; were
