外显子是指（）A、基因组中不被翻译的片段B、基因组中编码氨基酸的片段C、插入顺序D、

完形填空 从每小题A，B，C，D四个选项中选择能填入相应空白处的最佳答案。（10分）

               
Pleasant Sheep 喜羊羊                  Pretty Sheep 美羊羊
Hi! I’m Pleasant Sheep. I’m __小题1:___ boy. I’m seven __小题2:__ old. I have a    小题3:  mouth, and my 小题4: are big. My nose is small. I have four good  小题5: .We are movie stars(电影明星).We are   小题6:  the same class. They are nice to me. Pretty Sheep is my 小题7:   friend. She is a nice girl. Does she have big eyes? Yes, she 小题8: big eyes, too. Our （我们的）monitor(班长) is a girl. She is eight years old. She has a big head,  小题9:_  her eyes are small.   小题10: , who is she?

小题11:

A．a B．an C．the D．/

小题12:

A．years B．year C．/ D．ear

小题13:

A．small B．long C．wide D．short

小题14:

A．nose B．eyes C．leg D．hand

小题15:

A．students B．teachers C．cars D．friends

小题16:

A．at B．on C．in D．to

小题17:

A．big B．good C．nice D．small

小题18:

A．have B．has C．am D．is

小题19:

A．too B．but C．in D．from

小题20:

A．Guess B．Thank C．Know D．Meet