We should take good care of the elderly, as they are to the sudden change of weather.
A. sensitive
B. anxious
C. weak
D. positive
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(答案→)A. sensitive
B. anxious
C. weak
D. positive
解析：
试题分析:考查形容词辨析。A敏感的；B焦虑的；C虚弱的；D积极的。从语义判断老人应该是对突变的天气敏感，而且只有sensitive和to搭配，意思为“对。。。敏感的”句意：我们应该好好照顾老年人，因为他们对于突然的天气变化很敏感。