B
题干:作者划线的句子是什么意思?
A.种大蔬菜容易。
B.在竞争中取胜很难。
C.胡萝卜更容易种植。
D.胡萝卜是他最喜欢的蔬菜。
根据最后一段Every year, there are competitions for the largest vegetables, but don't hope to win: Britain's biggest carrot is almost six metres long.每年都有最大蔬菜的比赛,但别指望能赢:英国最大的胡萝卜将近6米长。
冒号起到解释说明的作用,根据but don't hope to win(但别指望能赢)可知画线句子的含义为在这场竞赛中获胜很难。Britain's biggest carrot is almost six metres long.这句话是具体解释了为什么获胜很难。故选B。