第26题: [单项选择]Color changes in chameleons (seem) to be caused by environmental temperature as well as by other external stimuli. A. have B. appear C. ought D. used 参考答案:B 答案解析:appear to“似乎”。seem to“似乎”;have to“不得不”;ought to“应该”;used to“过去(干某事)”。本题译文:变色龙颜色的变化似乎由周围环境的温度和其他一些外界刺