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Dear Mr Smith,

　    Thank you very much for invite me to go and stay with                           1.       

you in Nanjing.It’s the most beautiful city,and I have been                              2.       

eager to see you again.So I’m very sorry to tell you that I can’t                      3.       

go this summer vacation,since I’ve already been promised                              4.       

to stay with my grandmother in the countryside.She has                                 5.       

already 65 years old and miss me so much that I have no choice                      6.       

but do it.I’m busy preparing for my college entrance exams                                   7.       

all these days and I feel quite sure of myself.I wish I can go,                          8.       

and see you and Tom at the end this year.                                                     9.       

Best wishes to both you and Tom!                                                               10.       

Yours sincerely,

Song Ping

出生到1周岁，体重增加迅速，1周岁时将增加至出生时的3倍，出生到1周岁称为（）期

A.新生儿

B.婴儿

C.婴幼儿

D.乳儿

E.幼儿