问题 选择题

在水溶液中能大量共存的一组离子是(  )

A.Al3+、Na+、HCO3-、SO42-

B.H+、Fe2+、ClO-、Cl-

C.Mg2+、K+、SO42‑、NO3-

D.NH4+  Ag+、OH-、Br-

答案

A.Al3+与HCO3-发生互促水解反应而不能大量共存,故A错误;

B.酸性条件下Fe2+与ClO-发生氧化还原反应而不能大量共存,故B错误;

C.离子之间不发生任何反应,可大量共存,故C正确;

D.NH4+与OH-、Ag+与Br-反应而不能大量共存,故D错误.

故选C.

阅读理解

"Can I see my baby?" the happy new mother asked. When the baby was lying in her arms and she moved the cloth to look upon his tiny face, she gasped(吃力地喘着气). The doctor turned quickly and looked out of the hospital window. The baby had been born without ears. Luckily, time proved that the baby's hearing was perfect. Though the misfortune(不幸)happened to him, he grew into a handsome boy. Yet he felt ashamed when he communicated with others.

“You should get in touch with other young people,” his mother told him, with a kindness in her heart. The boy’s father talked with the family doctor about his ears. “Could nothing be done?” the father asked. “I believe I could give him a pair of outer ears, if they could be got,” the doctor replied.

Two years went by. One day, his father said to the son, “You are going to the hospital, Son. Mother and I have someone who will donate the ears you need, but it’s a secret.” The operation is a big success. Later he married and entered the diplomatic(外交的)service. One day, he asked his father, “Who gave the ears? Who gave me so much? I could never do enough for him or her.”

“You could, my son,” said the father, “but the agreement was that you are not to know…not yet.”

The years kept their secret, but one of the darkest days did come. He stood with his father over his mother’s casket(棺材). Slowly, the father stretched forth(伸出) a hand

and raised the thick, reddish brown hair to reveal the mother had no outer ears.

"Mother said she was glad she never let her hair be cut," his father whispered gently, "and nobody ever thought mother less beautiful, did they?"

小题1:Why did Mother gasp when she saw her newborn baby?

A.Because her son had a tiny face.

B.Because she saw her son crying.

C.Because her son was in her arms.

D.Because her son was born imperfect.小题2:Who gave the son the ears?

A.His mother.

B.His father.

C.A doctor.

D.A stranger.小题3:The underlined word “reveal” in the last but one paragraph means “________”.

A.see

B.show

C.find

D.search小题4:The best title for the passage would be ________.

A.Mother’s hair

B.An unforgettable memory

C.Who gave me the ears?

D.Who is my best respectable person?小题5:The main purpose of the passage is to tell readers that ________.

A.The secret was kept until the mother died.

B.Real love lies in what is done but not known.

C.The operation on the boy was a great success.

D.The boy entered the diplomatic service when he grew up.

单项选择题