阅读理解。根据短文内容，判断正(T)误(F)。

     I am an English girl.  My name is Mary.  I'm twelve.  My dad and mom are English teachers.  I have a

 brother (哥哥).  His name is Tom and he is thirteen years old.  We are in China now.  We are in Beijing

  No. 4 Junior High School.  Tom is in Class 4, Grade 7 and I am in Class 9, Grade 7.  I have a dog.  My

  dog  looks strong.  It has a big mouth and two big black ears.  We have many(许多) Chinese friends

 here.  They are good.

(     ) 1.  Mary comes from the U. S. A.

(     ) 2.  Mary and Tom are in the same class, but they are in different grades.

(     ) 3.  Mary's dog's mouth and ears are big.

(     ) 4.  The dog's ears are white.

(     ) 5.  Tom and Mary have many friends in China.

急性化脓性腹膜炎最主要的症状是（）

A.恶心、呕吐

B.腹痛

C.发热、乏力

D.腹泻

E.休克