题目内容：
请根据短文内容，回答题。Ancient man attempted to change the weather by using magic．When experience taught him this was impossible．he tried t。forecast weather conditions．Even earlier than 1，000 8·C·there were seers(预言家)in Babylon and priests clever enough to denounce as cheaters who predicted the weather a year in advance．
Some forecasters used methods that seem to have no connection with the actual factors controlling the weather．Chickens and other animals were sacrificed and their intestines(肠)poked to find signs indicating rain or drought．
Somewhat more scientific" were predictions based on vegetation：onion’s skin very thin，mild winter coming in．Onion’s skin thick and tough，coming winter cold and rough.
Insects and animals were also favorite clues：when the glowworm lights his lamp，then the air is always damp．If spiders forsake their cobwebs，the weather will for certain break. If frog remained in pools，the weather would be fine．If they Were seen on rocks，rain and cold were due.
The author seems to think that animal sacrifices were________. A．effective in foretelling the weather
B．successful in foretelling rain or drought
C．unscientific ways of trying to foretell the weather
D．an improvement on ancient man’s method
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