下列各项中，与环境中温度变化相适应的现象是[ ]

A．青蛙的冬眠

B．仙人掌具有针状叶和肥厚肉质茎

C．鼠类夜间出来活动

D．苍耳果实表面生有倒钩

We're tired because we have ______ yin. [ ]

A. too many

B. too much

C. much too

D. many too