In what way does Laura Lenox-Conyngham make her living（）
A. By taking photographs for magazines.
By marring a rich man.
C. By subletting the lounge sofa-bed to her brother.
D. By preparing food for photographs for some magazines.
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SF？开关气体报警压为（）Mpa
A. 5
B. 45
C. 3
要做到“安全第一”,就必须（）
A. 安全系数越高越好
B. 将高危作业统统关掉
C. 安全优先”的原则
高空作业的安全措施中,首先需要（）
A. 安全网
B 安全带
C. 合格的工作台
Paragraphs 2 and 3 explain ________.
A. those good things are not without side effects
B. why clever advertising is so powerful
C. why in modern times self-medication is still practised
D. why people develop faulty ways of life
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