As it is sensitive to large temperature ________, care should be taken to maintain a stable temperature.
句意：由于它对温度的大幅度波动很敏感，因而应该使其保 持在一个稳定的温度。fluctuation起伏，波动。transition过渡；转变。transformation变形；转化。exchange交换；交流。因此，本题的正确答案为A。