HDLC的帧格式中，帧校验序列字段占( )。A．2 bit B．8 bit C．2

阅读理解。

     Washington (Reuters)-People who drink two or more sweetened soft drinks a week have a

much higher risk of pancreatic cancer (胰腺癌),an unusual but deadly cancer,researchers reported

on Monday.

     People who drank mostly fruit juice instead of sodas did not have the same risk,the study of

60,000 people in Singapore found.

     Sugar may be to blame but people who drink sweetened sodas regularly often have other poor

health habits,said Mark Pereira of the University of Minnesota,who led the study.

     "The high levels of sugar in soft drinks may be increasing  the level of insulin (胰岛素) in the body,

which we think contributes to pancreatic cancer cell growth," Pereira said in a statement.

     Writing in the journal Cancer Epidemiology,Biomarkers & Prevention,Pereira  and his colleagues 

 said  they  followed 60,524 men and women in the Singapore Chinese Health Study for 14 years.

     Over that time,140 of the volunteers developed pancreatic cancer.Those who drank two or more

sweetened soft drinks a week had an 87 percent higher risk of being among those who got pancreatic

cancer.

     Pereira said he believed the findings would apply elsewhere.

     "Singapore is a wealthy country with excellent healthcare.Favorite pastimes (消遣) are eating and

shopping,so the findings should apply to other Western countries," he said.

     But Susan Mayne of the Yale Cancer Center at Yale University in Connecticut was cautious.

     "Although this study found a risk,the finding was based on a relatively small number of cases and it

remains unclear whether it is a causal (因果的) connection or not," said Mayne,who serves on the board

of the journal,which is published by the American Association for Cancer Research.

     Pancreatic cancer is one of the deadliest forms of cancer,with 230,000 cases globally.In the United

States,37,680 people are diagnosed with pancreatic cancer in a year and 34,290 die of it.

1．According to the text,who is in control of the health study?

A．Mark Pereira.  

B．Scientists from Singapore.

C．Researchers in Yale.  

D．Susan Mayne.

2．We can infer from Pereira's words that________.

A．the healthcare in Singapore should be greatly improved

B．2 soft drinks a day are considered harmful to health

C．87 out of 140 volunteers developed pancreatic cancer

D．sugar might not be the only cause of pancreatic cancer

3．How does Susan seem to feel about the findings of the study?

A．Satisfied.  

B．Doubtful.  

C．Worried.  

D．Hopeful.

4．The best title of the text might be________.

A．The Deadliest Forms of Cancer

B．Drink Fruit Juice Instead of Sodas

C．A Study in University of Minnesota

D．Sugary Soft Drinks Lead to Cancer

发行企业并未将剩余收益分配给股东，而是用于追加投资扩大再生产，在这种假设下，普通股股票评估模型应该是()。

A.固定红利型

B.红利增长型

C.分段型

D.整体型

请用简洁的语言概括图片所蕴含的道理。

________________________________________________________________________________

变应性皮肤血管炎主要涉及的体液免疫反应类型是（）

A.Ⅰ型变态反应

B.Ⅱ型变态反应

C.Ⅲ型变态反应

D.Ⅳ型变态反应

E.Ⅰ型与Ⅲ型变态反应

（）温州改郡置州，因气候温暖，“虽隆冬而恒燠”，故名温州。

A.唐代

B.南北朝

C.宋代

D.明代