在1961年,本生和基尔霍夫发现了一种新的碱金属元素,根据已学知道解答下列问题,

题型:填空题

问题:

在1961年,本生和基尔霍夫发现了一种新的碱金属元素,根据已学知道解答下列问题,帮助这两位科学家研究该元素。

(1)该元素单质的密度比水的密度大,则该元素可能是_______________________________。

(2)该元素的单质与水反应比钾与水反应剧烈,但没有铯与水反应剧烈,由此可确定该元素是________。其确定依据是_____________________________________________________。

(3)人类制备出该元素的单质比钠单质要晚得多,分析其中的原因:__________________。

考点:构成物质的粒子—分子、原子、离子元素周期律
题型:填空题
12小时12分=______小时,1
1
2
公顷=______平方米.
题型:填空题

寿险公司保单红利支出所产生的现金流出属于( )。

A.经营活动产生的现金流量

B.管理活动产生的现金流量

C.筹资活动产生的现金流量

D.投资活动产生的现金流量

题型:填空题

多数食品易吸收空气中的水分而潮解,并吸收空气中的氧气而腐败。生产上多在食品中放一小包CaO粉末,保持干燥。现研究成功在食品中放一小包铁粉,铁粉吸收水分和氧气变为铁锈。用铁粉代替CaO粉末的优点是                             。                 

题型:填空题

下述哪些病变有可能发生癌变()

A.代偿性增生

B.过度增生

C.鳞状上皮化生

D.肠上皮化生

E.萎缩

题型:填空题

阅读表达。

     阅读下面的短文, 并根据短文后的要求答题.  ( 请注意问题后的词数要求 )

       If you are a male and you are reading this,congratulations:you are a survivor.  According to statistics,

you are more than twice as likely to die of skin cancer as a woman,and nine times more likely to die of

AIDS.

     There are many reasons for this. Typically,men take more risks than woman and are more likely to

drink and smoke but perhaps more importantly,men don't go to the doctor.

     Gullotta,a professor from a famous medical university,says a healthy man should visit the doctor every

year or two.For those over 45 ,it should be at least once a year.

     Two months ago Gullotta saw a 50-year-old man who had delayed doing anything about his smoker's

cough for a year.

        According to a recent survey,95% of women aged between 15 and early 40s see a doctor once a

year,compared to 70% of men in the same age group.

       " A lot of men think they are absolutely strong," Gullotta says. They only come in when a friend

drops dead on the golf course and they think," Geez,if it could happen to him,________. "

         Then there is the ostrich approach, " Some men are scared of what might be there and would

rather not know, " says Dr. Ross Cartmill.

        " Most men get their cars serviced more regularly than they service their bodies," Cartmill says.  He

believes most diseases that commonly affect men could be addressed by preventive check-ups.  Cartmill

says " regular check-ups for

men would surely place stress on the public purse,but prevention is cheaper in the long run than having

treat the diseases. " Besides,the ultimate cost is far greater:it is called premature death.

1.  What is the best title of the passage?  ( Please answer within 10 words)

   ______________________________________________________________________________

2. Which sentence in the passage is the closest in meaning to the following one?

   In his opinion, medical examinations in advance can help solve some common male diseases.

   _______________________________________________________________________________

3.  Please fill in the blank in the sixth paragraph with proper words or phrases to complete the sentence. ( Please answer within 10 words)

_______________________________________________________________________________

4.  Give three suggestions for men to keep healthy. ( Please answer within 30 words)

①__________

②__________

③__________

5. Translate the underlined sentence in the last paragraph into Chinese.

   ____________________________________________________________________

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