有一种小动物夏天夏眠，冬天冬眠，可以四年不吃东西仍能存活。它是（）

A.北极熊

B.蟑螂

C.蜗牛

D.甲壳虫

Steady precipitation is typical of（）．

A.Coming cold weather conditions

B.A warm front weather condition

C.High pressure conditions

D.Scattered cumulus cloudsduring the day