科学家研究发现，奶牛不仅有预知下雨的能力，还有第六感：能知地球南北方位，而且不论什么风向和时辰，总是面朝北站立。这告诉我们[     ]

A．每一种生命都有其独特性

B．奶牛是地球上最珍贵的财富

C．每一种生命都有其存在的意义和价值

D．奶牛是各国的重点保护动物

His efforts to raise money for his program were ________ because no one showed any intention to take a cent out of their pockets.

A．in place

B．in sight

C．in effect

D．in vain