免疫球蛋白IgG的结构如图所示，其中-S-S-表示连接两条相邻肽链的二硫键。若该IgG由m个氨基酸构成，则该IgG有肽键数（）

题干

A：m个

B：（m+1）个

C：（m-4）个

D：（m-2）个

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C

录音中有一篇短文，是德州市第16中学校园广播电台播放的主题节目“Story Of The Week”，宗旨是宣传好人好事，培养学生的优秀道德品质．听广播两遍后，请你根据表格内容提示，记录相关信息，完成表格（每空一词）．

Story Of The Week
Who	Zhang Ming in Class 6，Grade 9
When	on the afternoon of____26th
Where	around a corner on his way back home from school
What	found a ____lying on the ground
How	waited for one and a half ____but nobody came； found a name card with a ____number； called the man on the name card
The owner（主人）	wrote a ____to the school and thanked Zhang Ming
Comments（评价）	kind and honest