Experts have learned from studying other disasters, such as Oklahoma City bombing, the【C1】______of Sept. 11 and the【C2】______of

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问题     Experts have learned from studying other disasters, such as Oklahoma City bombing, the【C1】______of Sept. 11 and the【C2】______of TWA Flight 800, that the psychological effects of the tragedy may【C3】______for months, and in some people for years. Those who are most vulnerable are at highest【C4】______of developing long-lasting symptoms, dubbed post-traumatic stress disorder, or PTSD. Without【C5】______, these people can【C6】______impaired personal relationships, job loss or difficulty socializing with others.
    Many more Americans, who may be【C7】______what experts call "a normal reaction to an【C8】______event" , will start to feel better over the next few days or weeks. Researchers say it is common for people to experience a plethora of symptoms as they【C9】______to come to grips with their shock and unexpected【C10】______like the Columbia’s demise.
    Saturday’s tragedy may also【C11】______relapses in patients who were【C12】______successfully with PTSD, experts say. No one can be sure who among us will end up suffering【C13】______psychological or emotional【C14】______. But some people are at a higher risk than others. A【C15】______of factors-how close people were to the wreckage and exactly what they saw,【C16】______friends or loved ones were killed, and whether there was a pre-existing【C17】______unlike the Sept. 11.【C18】______many Americans, the emotional fallout will be limited, experts say. That is because most have no personal【C19】______with the tragic events. "Most people don’t have a【C20】______who is involved with space travel ," says Dr. Holly Schneier, an assistant clinical professor of psychiatry at Columbia University, " and few people observed the disaster first-hand. "
    Schneier also says people don’t identify with the astronaut in the same way they did with the victim of Sept. 11. "We all know they had a high-risk job and they understood that risk, "she ex-plains. "That’s not like going to the office for a routine day of work and fully expecting to come home and then dying in a terrorist attack. "
【C11】

选项 A、happen
B、take place
C、trigger
D、operate

答案C

解析 本题考查动词的辨析。trigger“引起,触发”,此处指周六的悲剧事件可能引发旧病复发;take place和happen都表示“发生”,为不及物动词,不能接宾语;operate“运转,操作”,不合句意,不可选。
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