在图案填充时，“添加：拾取点”方式是创造边界灵活方便的方法，关于该说法错误的是（）。

下列反应中，不属于离子反应的是（   ）

A．Ba(OH)₂溶液和稀盐酸的反应

B．NaOH溶液和CuSO₄溶液的反应

C．点燃H₂和Cl₂的混合气体使之反应

D．Na₂CO₃溶液和稀H₂SO₄溶液反应

某门式刚架单层厂房基础，采用钢筋混凝土独立基础，如图5-21所示，混凝土短柱截面500mm×500mm，与水平作用方向垂直的基础底边长ι＝1.6m，相应于作用的标准组合时，作用于混凝土短柱顶面处的竖向力为Fk，水平力为Hk，基础采用混凝土等级为C25，基础底面以上土与基础的加权平均重度为20kN／m3，其他参数见图5-21。

假设基础底面边长b＝2.2m，若按承载力极限状态下作用的基本组合（永久作用控制）时，基础底面边缘处的最大基底反力值为260kPa，已求得冲切验算时取用的部分基础底面积A＝0．609m，试问，图5-21中冲切面承受冲切力设计值（kN），与下列何项数值最为接近（）？

A.60

B.100

C.130

D.160

American researchers say drinking tea may help strengthen the body’s defense system against infection（感染）．Doctors at Brigham and Women’s Hospital in Boston，Massachusetts，did the study．The team studied a chemical found in black，green，oolong and pekoe tea This chemical is an amino acid（氨基酸）called L-theanine．The scientists say it may increase the strength of Gamma delta T cells，which are part of the body’s defenses．

First，the researchers mixed some of these cells with antigens（抗原）found in the amino acid Antigens help the body react to infection．Then the scientists added some bacteria（细菌）．

Within twenty-four hours，the cells produced a lot of interferon，a substance that fights infection Cells not mixed with the antigens did not produce interferon．

In the second part of the study，eleven people drank five to six cups of black tea every day．Ten other people drank the same amount of instant coffee．That is dried coffee mixed with hot water．

Two weeks later，and again two weeks after that，the researchers tested the blood of all twenty-one people．They also looked at what happened when they added bacteria to the blood cells．They found that the tea drinkers produced five times more interferon after they started drinking tea The coffee drinkers did not produce interferon．

Doctor Jack Bukowski led the study He says the antigens added to the Gamma delta T cells were responsible for the increased reaction to the bacteria．He says the study also showed that the cells were able to remember the bacteria and fight them again the next time．

Earlier research already has found that tea can help prevent heart disease and cancer Doctor Bukowski says the new study must be repeated with more people．If the findings prove to be true，he says，then tea drinking might also help protect against bacterial infections．He says the amino acid L-theanine could be removed from tea and used as a drug to strengthen the body’s defenses．

73．We may know from the text that     can be found in different kinds of tea．

A．Gamma delta T cells                               B．L-theanine

C．interferon                                       D．bacteria

74．Tea may help strengthen the body’s defense system because it helps    ．

A．the body to produce more interferon

B．the body to produce more Gamma delta T cells

C．to add some bacteria to the blood cells

D．to mix antigens with some of the cells in the body

75．According to Dr Bukowski，    ．

A．the findings of the study have already proved to be true

B．he bas taken some amino acid L-theanine from tea and made a drug with it

C．further study is needed to prove the findings true

D．he is not sure whether tea can help prevent heart disease and cancer

现代史学家陈寅恪认为：韩愈不仅 “结束南北朝相承之旧局面”，而且“开启赵宋以降之新局面”，是“唐代文化学术史上承前启后、转旧为新关捩（lie）点之人物。”韩愈在文化学术上的贡献在于

A．提出“致良知”学说

B．主张儒、佛、道并重

C．创立了理学体系

D．致力于复兴儒学

患者男性，50岁，25年前因输血感染丙肝，近半年出现食欲减低，乏力，右上腹胀痛，各项指标均未达到失代偿期。

此时如果抗病毒治疗，不能采用下列哪种治疗方案（）

A.PEG-INFα联合利巴韦林

B.普通干扰素联合利巴韦林

C.单用普通干扰素

D.单用利巴韦林

E.中药