在Visual FoxPro的数据工作期窗口，使用SET RELATION TO命令

照样子用画线的词语写句子。

1．他在田边焦急地转来转去。    

     焦急地——                                                                  

2．那个人自言自语地说：“我得想个办法帮它们长。” 

    自言自语——                                                                

3．丑小鸭来到世界上，除了鸭妈妈，谁都欺负他。

    除了……都……                                                               

用浓硫酸配制一定溶质质量分数的稀硫酸，若用量筒量取浓硫酸时仰视刻度，而量水时俯视，则所得溶质质量分数比要求配制的溶质质量分数（　　）

A．偏高

B．偏底

C．相同

D．无法判定

根据所学课文填空。

这么多树枝在大地里面_________，吸收着大地母亲给予它的食粮的_________，而这大地就是印度的广大_________。

Scientists from the Max Plank Institute for Biological Cybernetics in Tubingen, Germany, have presented the first experimental evidence that people do end up walking in circles if lost in unfamiliar areas．The study, published in the journal Current Biology, examined the tracks of people who walked for several hours in the Sahara desert in Tunisia and in the Bienwald forest in Germany．Researchers Jan Souman and Marc Ernst said the scientists used the global positioning system （GPS） to record these paths．The results showed that the walkers were only able to keep a straight line when the sun or moon was visible．As soon as the sun disappeared behind some clouds, people started to walk in circles without even noticing it．

Souman said one explanation offered in the past for people walking in circles was that most people have one leg longer or stronger than the other, which would produce a systematic bias（偏差） in one direction．To test this．the researchers asked people to walk straight while blindfolded which removed the effects of vision．They found that these circles were rarely in a systematic direction, with the same person sometimes switching to the left and sometimes to the right．

"Most of the participants in the study walked in circles, sometimes in extremely small ones．Walking in circles is therefore not caused by differences in leg length or strength, but more likely the result of increasing uncertainty about where straight ahead is," said Souman, "Small random errors （随机性误差） in the various sensory signals that provide information about walking direction add up over time, making what a person perceives to be straight ahead drift away from the true straight ahead direction．"

72．The underlined word "this" in Paragraph 2 refers to _____．

A．the effects of vision             B．a systematic bias

C．the leg length differences         D．one explanation offered in the past

73．What is the probable reason for people's walking in circles?

A．The invisible sun or moon．

B．The increasing uncertainty about directions．

C．Differences in leg length or strength．

D．Wrong signals providing information about areas．

74．Why are the subjects required to be blindfolded?

A．To encourage them to walk straight．    B．To stop them from seeing each other．

C．To dismiss the effects of vision． D．To keep the test a top secret．

75．Which of the following statements is true?

A．People walk straight in the day．

B．The farther people walk, the greater the direction bias grows．

C．People walk only in large circles．

D．Researchers use the global positioning system to record their tracks．

下列意外伤害保险中，属于普通意外伤害保险的是（）

A．建筑工地意外任务保险

B．学生团体平安保险

C．索道游客意外伤害保险

D．游泳池意外伤害保险