题目

With the help of the German experts, the factory produced cars in 1993 as the year before. A . as twice many B . twice as many C . as twice as many 答案：B在一个苹果中生有10个发育成熟的种子，那么，在完成受精过程时，最少需要的精子数是（　　） A、40个B、30个C、20个D、10个