在海洋中生活的鲸，它的体温是恒定的，而鲨鱼的体温是随海水的温度而变化的。[ ]
√
股票的市场价值一定大于股票的票面价值。
The search was________when night came,even though the child had not been found. [ ]
A. approved
B. acquired
C. achieved
D. abandoned
