选词填空。

1. Etta ______________ (have, has) a teddy bear.

2. Let's go to the ______________ (clothes, toy) department to buy a new skirt.

3. She ______________ (don't, doesn't) like the clothes there.

4. She ______________ (finds, looks for) him everywhere.

5. It's time ______________ (go, to go) to sleep.

下列关于染色体组、单倍体、二倍体和多倍体的叙述中，正确的是（）

A.一个染色体组中一定不含同源染色体

B.由受精卵发育而成的体细胞含有两个染色体组的个体叫二倍体

C.含一个染色体组的个体是单倍体，但单倍体不一定只含一个染色体组

D.人工诱导多倍体唯一的方法是用秋水仙素处理萌发的种子或幼苗