阅读小天地。

      Jim is my friend. He lives in America. There are five people in his family: his father, mother, sister and

brother.

      His father is Mr. Smith. He is forty-one years old. He is a doctor. Jim's mother is a bus driver. She is forty

years old. His sister's name is Rose. She is older than Jim. His brother, Bob is younger than Jim.

      Jim and his brother look different. Jim has black hair and blue eyes, but his brother has brown hair.

根据短文内容，判断下列句子的正(T)误(F)。

( ) 1. Jim is an American.

( ) 2. Jim's father has 3 sons.

( ) 3. Jim's mother is forty-one years old.

( ) 4. Jim's sister is younger than Jim's brother.

( ) 5. Bob has brown hair.

( ) 6. The two boys look the same.

配制硝酸银溶液，应检验水中无（）。

A.N03-

B.SO42-

C.Cl-

D.HCO3-