The saying about onion is （）

单项选择题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

单项选择题This passage is mainly to remind American citizens of （）.

A．the importance of applying for a passport and visa
B．safety regulations for visiting other countries
C．the limitations to traveling around the world
D．the requirements for their traveling abroad