体内蛋白质代谢的终产物是（）
A.乳酸
B.胆红素
C.尿素
D.尿酸
E.肌酐
参考答案：C
解析：本题考查尿素的来源，尿素是体内蛋白质代谢的终产物。
单词拼写
小题1:I’m________ (羞愧)of my feeling,and I don’t want to rewind the recording of my life.
小题2:He is very successful,but he remains m________ about his success.
小题3:Her face was grey with ________(疲惫)
小题4:He jumped into the river to save the drowning child without _________(犹豫)
小题5:Her name,J.K.Rowling is forever a_________with Edinburgh in Scotland.
二次回路是由（）、保护、测量和信号等回路构成
A.控制
B.电压
C.电流
D.遥控
