短文改错

     Dear Jim,

     I am so exciting that you will come to China.I will free from December 18 and will have a plenty of

time to be together with you.I'll meet you at the airport and then you will take Bus No.8 for my home.You

worry about the weather here in your email.In fact,the weather here is quite different from it in your city.

It isn't very cold,but you needn't bring many clothes with you.During your stay here,I'll take you to some

places of interests and you can taste some local snacks.I am sure we will have greatly fun together.

Looking forward to meeting you soon.

     John

改错：________________________________________________________________________

硝酸铵是（）晶体。

A.白色

B.黄色

C.淡黄色