在扬州瘦西湖划船，远方的主景是白塔，通向白塔的两岸是长堤春柳。从湖中看两岸长堤春柳与

设关系模式R(A，B，C)有函数依赖集F={A→B，B→C)，则关系R的规范化程度至多达到( )。

A．1NF

B．2NF

C．3NF

D．BCNF

Three high students become heroes after their act of saving a baby’s life.

Andrew Willis, 15, his brother Chris, 13, and friend Reece Galea, 14, were walking along Swallow Drive on their way to school on May 23, when Nicholle Price ran out of her house, shouting for help. Her six-month-old son Corey had swallowed (吞下) an earring （耳环） and the young mother couldn’t ring for help because something was wrong with her phone. The three teenagers rushed to the aid of Ms Price, called an ambulance (救护车), calmed her down and waited with her until the ambulance arrived before heading to school.

Ms Price, Corey and his grandmother Joyce Finnie visited the school last Thursday to thank the boys for their kind action. “It’s good to know that there are still some good people who will stop and help,” Ms Price said. “While I was shouting for help, a woman walking her dog went straight past, without stopping. I don’t know what would have happened if these boys had not stopped.”

The teenagers were shocked at the attention they received at school for their heroic act but admitted that the incident was nerve-racking(刺激神经的). “We heard her shouting so we knew something wasn’t right,” Andrew said. “We thought someone had died. It was scary （惊慌的） but we just did what we had to do.”

Just as proud as the boys’ parents is their principal, Tim McCallum.

After two days in hospital, Corey has now fully recovered. “He’s got two new teeth to show,” Ms Price said. “I have to keep a closer eye on him. He’s into everything now and grabs whatever he finds to put it straight into his mouth.”

小题1:The three high students were _____ when a woman ran out of her house shouting for help.

A．playing near the house

B．on their way to school

C．walking their dogs nearby

D．on their way back from school小题2:Ms Price spoke of a woman walking her dog without stopping to show _____.

A．how dangerous the case was

B．how brave the three boys were

C．why the three teenagers’ action was heroic

D．how clever the three boys were小题3:The underlined sentence in the 4th paragraph probably means “_____”.

A．they didn’t expect they would be given so much praise

B．they felt excited to have become so famous after the incident

C．they were supposed to receive so many prizes for their good deed

D．they were proud of the attention they received at school for their heroic deed小题4: Which would be the best title for this passage?

A．How a baby was saved after swallowing an earring

B．Why the mother shouted for help

C．Baby life saved: teenage heroes earn high praise

D．A mother came to school to thank 3 teenagers

对特定企业所属的成本中心来说，变动成本和直接成本大多是可控成本；而固定成本和间接成本大多是不可控成本。 ( )

对PON系统中对EC2固件升级时候应该选择升级项目是（）。

A.PON接口盘软件

B.TDM软件

C.OLT固件

D.核心交换盘软件

泡沫渣