单选题 Persons who have uneven temperaments appear to have a much greater chance of developing serious illness and of dying young than those with other temperaments, Drs. Barbara J. Betz and Caroline B. Thomas report in the Johns Hopkins Medical Journal. In 1984, Betz and Thomas classified 45 Johns Hopkins medical students in three personality groups on the basis of psychological tests and questionnaires. The students were listed either as "alphas", described as cautious, reserved, quiet and understanding; "betas", spontaneous, active and outgoing; or "gammas", moody, emotional and either over- or under-demanding. "Too often, gamma people get lost in their own emotion," says Bets. "While a person's temperament cannot be changed, more support from outside sources --- such as more human contacts --- might help lessen a gamma's risk of disease."小题:Which of the following is good for gamma people