单项选择题
All the passengers were killed in the air（）except the airhostess，who survived it only to die of hunger and thirst in the desert.
A.crashB.smashC.clashD.crisis
单项选择题 On（）Shanghai they went to see the director at once.
单项选择题 When payments are made every week the usual word is（）.
多项选择题 职业人群健康监护分为（）、离岗后医学随访检查以及应急健康检查等5类。
