In the following words， which underlined（划线的） letter has a different sound from the others？（ ）
| A． |
duck |
B． |
brush |
C． |
human |
Don't throw rubbish everywhere． Building a civilized（文明的） school yard is our duty．
．（ ）
A．OK，I willB．You are joking
C．Take it easyD．Sorry， I won't
My friends and I will go camping today．
．（ ）
A．My pleasureB．Thanks a lot
C．Have a nice dayD．Nice to meet you
How about raising some clothes for the poor？
．（ ）
A．You're welcomeB．Good idea
C．Yes， I doD．Not at all
I'm sorry． I took the wrong seat．
． I will take yours instead．（ ）
A．No wayB．Better not
C．Excuse meD．It doesn't matter
Happy Children's Day， Mike!
， Mum．（ ）
A．Thank youB．Sorry
C．Me， tooD．The same to you