A、Headaches. B、Insomnia. C、Respiratory problems. D、Digestive problems. C题目问的是“根据英国心理学家，规律地写日记者更容易经历什么，除了________。”由定位句可知，他们更容易头疼

Keeping a diary is bad for your health, say UK psychologists. They found that people who regularly keep a diary suffer from headaches, sleeplessness, digestive problems and social awkward-ness more than people who don’ t. This finding challenges the assumption that people find it easier to get over a traumatic event if they write about it.
    "We expected that diary keepers to have more benefits or be the same but they were worst off," says Elaine Duncan of Glasgow Caledonia University. " In fact, you will probably be much better off if you don’t write anything at all. " she adds.
    The study carried out with David Shefield of Staffordshire University was presented on Wednesday at a meeting of the British Psychological Society at Edinburgh. The peer studied 94 regular diarists, and compared their health with that of 41 non-diarists. The subjects, all students at Staffordshire University, answered questions about their diary keeping habits and filled in a standard questionnaire.
    Q16: According to UK psychologists, regular diarists are more likely to suffer from the following EXCEPT________.
    Q17: When and where was Duncan study presented?
    Q18: How many subjects were there in Duncan study?