下列说法正确的是：
①人（2n=46）一个染色体组有23条染色体，人的单倍体基因组有23条染色体
②普通小麦（6n）的花药离体培养后，长成的植株细胞中含三个染色体组，但不是三倍体
③番茄（2n）和马铃薯（2n）体细胞杂交形成的杂种植株含两个染色体组
④马和驴杂交的后代骡是不育的二倍体，而雄蜂是可育的单倍体

阅读短文，判断正误。

    I'm Fangfang. I live in a village. It's small but beautiful. Look! That is my house. There are some trees near it. Behind the house there's a big river. You can see boats on the river. Many ducks are beside the boats. How lovely! Oh, many flowers are among (在……之中）the trees. Let's get some for our teachers.

在细胞分裂过程中，最先分裂成两份的是（ ）

小明去年储蓄x元，x÷12表示____。