题目

阅读理解。 Mr Rabbit gets three carrots in a garden.“I will make carrot soup，” he says. He meets Miss Pig.“May I have a carrot，please？” Miss Pig asks.“Yes，here's a carrot for you，” Mr Rabbit answers. Then Mr Rabbit meets Mr Goat.“May I have a carrot，please？” Mr Goat asks.“Yes，here's a carrot for you，” Mr Rabbit says. At last Mr Rabbit meets Mr Mouse.“May I have a carrot，please？” Mr Mouse asks.“Yes，here's a carrot for you.” Mr Rabbit gives the carrot to Mr Mouse. Mr Rabbit goes home without any carrots. After a few moments (瞬间)植物茎的结构中，筛管的作用是 A．输送水分                                                                   B．输送有机物 C．输送无机盐                                                     D．输送水分和有机物