如图，在□ABCD中，EF//AB，GH//AD，EF与GH交于点O，则该图中的平行四边形的个数共有          （  ）

基因好像盖房子的蓝图．基因表达自己所携带的遗传信息，从而控制生物个体的性状表现，是通过指导下列哪项实现的（　　）

选出相对应的答句。

①Touch your mouth.____                      A. Four books.

②How many books?____                      B. This is my mouth.

③Here you are.  ____                        C. Here you are.

④Give me a pencil, please.____                D. One, two. Two pencils.

⑤How many pencils?____                    E. Thank you.