关于骨盆的组成，下列哪项不确切：A．骶骨B．尾骨C．髂骨D．坐骨E．椎骨

质数只有（    ）和（    ）两个因数，合数至少有（    ）个因数。

有关汛期工程控制运用说法不正确的是（）。

A、渠道水位的控制应在灌溉期控制标准的基础上适当降低

B、渠道流量的控制应在灌溉期控制标准的基础上适当降低

C、局部降暴雨时，应提前采取停止或减少引水，或者分段排水措施

D、洪水骤然入渠，渠道维护管理人员需汇报后方可采取泄洪措施

A公司于2005年1月1日以450万元的价格，购入B公司10%的股份，作为长期投资并采用成本法核算。2005年3月6日B公司分配2004年度现金股利500万元。2005年度B公司实现净利润为900万元。2006年3月6日分配2005年度的现金股利700万元。 A公司股东大会决议将其分得的现金股利作为追加投资。B公司分配现金股利后，2006年A公司对B公司的投资的账面价值为( )万元。

A．490

B．470

C．500

D．495

水冲洗应以管内可能达到的最大流量或不小于（）的流速进行。

A、1.0m/s

B、1.5m/s

C、2.0m/s

D、3.0m/s

阅读理解。

     Many people may be surprised by the number of chemicals that they are exposed to through

everyday household products．

     In a study 25 women had their homes and bodies tested for 89 environmental pollutants-including

pesticides (杀虫剂) and chemicals found in plastics and cleaning products．On average 20 chemicals

were found on their bodies or in their homes．

     Much is unknown about the possible health effects of chemicals in everyday household products．

But certain chemicals-like phthalates (邻苯二甲酸盐) found in plastics-have been linked to potential

health risks,including higher risks of certain cancers,though the evidence mainly comes from research

on lab animals．Other household chemicals are known to harm the skin,eyes and airways-and may

worsen asthma (哮喘)．Many more chemicals found remain untested．

      Chemicals likely come from a range of sources,so it is not always clear how to reduce people's

exposure,according to Dr．Rebecca Altman,the lead researcher on the new study．"However," she

said,"there are still measures people can take．"

      In the original study,she noted,women were given advice based on the particular chemicals they

were exposed to-such as using fragrancefree washing liquid and personalcare products．

For the current study,Altman and her colleagues interviewed two dozen women who'd taken part in

the previous study to see how they would react to information about their household chemical exposures．They found that the women were generally surprised at the range of chemicals found in their homes and

bodiesThey were also surprised that even some banned things were found．

     With many questions about the health effects of household chemicals unanswered,some experts worry

that giving people information about their everyday exposures will cause unnecessary fear．However,the

researchers found that the women in their study were typically not alarmed,and instead wanted "more

rather than less" information on the issue．

1．Which of the following statements about chemicals in household products is TRUE?

A．Some of them have bad effects on health,while some have good effects．

B．Longterm exposure to them is certain to cause a deadly illness．

C．In the study it was found that certain chemicals can cause cancers．

D．It is uncertain what effects some chemicals have on health．

2．The underlined word "airways" in Paragraph 3 most probably refers to ________． 

A．the passage running from your nose and throat to the lungs

B．things that look like fine threads growing in the body

C．the passage between rows of rooms in a building

D．the area just inside the front door of a building

3．According to Dr．Rebecca Altman,________．

A．women were more likely to be harmed by chemicals

B．fragrant products may contain harmful chemicals

C．it is unnecessary to inform people about the study results

D．further study on everyday products should be done immediately

4．What was the women's attitude towards the study results?

A．They were angry that so many chemicals were found．

B．They refused to be subjects for the study any more．

C．They were afraid of getting bad news about their health．

D．They would like to know more related information．