The elderly need special care in winter, as they are to the sudden change of weather.
A. sensitive
B. negative
C. flexible
D. sensible
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(答案→)A. sensitive
B. negative
C. flexible
D. sensible
解析：句意，老年人在冬天需要特殊的关照，因为他们对于天气的突然改变很敏感。Sensitive敏感的negative消极的flexible灵活的sensible明智的，根据题意，故选A。