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问题 单项选择题 A1型题

视网膜母细胞瘤的遗传方式是

A．常染色体显性遗传

B．常染色体隐性遗传

C．x-性连锁隐性遗传

D．线粒体DNA遗传

E．以上都不是

答案

参考答案：A

解析：视网膜母细胞瘤的遗传方式只有一种，属常染色体显性遗传。

多项选择题

下列说法中，关于编制按时间进度的施工成本计划，正确的有（）。

A．按时间进度的施工成本计划，通常可利用控制项目进度的网络图进一步扩充而得

B．在建立网络图时，除确定完成各项工作所需花费的时间外，还要确定完成这一工作的施工成本支出计划

C．在编制网络计划时，应充分考虑进度控制对项目划分要求，不必考虑施工成本支出计划对项目划分的要求

D．要求将按子项目分解项目总施工成本与按施工成本构成分解项目总施工成本两种方式相结合

E．在编制网络计划时，应在充分考虑进度控制对项目划分要求的同时，还要考虑确定施工成本支出计划对项目划分的要求，做到二者兼顾
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     Throughout history man has had to accept the fact that all living things must die. But people now live
longer than they   1  .Yet, all living things still show the   2  of aging, which will eventually    3  death.    
     Aging is not a disease, but as a person passes maturity (成熟期), the cells of the body and the    3  
they form do not function as well as they    5  in childhood and teenage years. The body provides less    6  against disease and is more   7  to have an accident.
     A number of related causes may   8   to aging. Some cells of the body have a fairly long life, but they
are not   9   when they die. As a person ages,    10  of brain cells and muscle cells decreases.   11   body
cells die and are replaced by new cells. In an aging person the   12   cells may not be as workable or as
capable   13   growth as those of a young person.
     Another   14   in aging may be changes within the cells    15  . Some of the protein chemicals in cells are known   16   with age and become less elastic (有弹性). This is why the skin of old people wrinkles and
  17  . This is also the reason why old people   18   in height. There may be other more important chemical changes in the cells. Some complex cell chemicals, such as DNA and RNA, store and   19   information
that the cells need. Aging may affect this   20   and change the informationcarrying molecules so that they
do not transmit the information as well.
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C．approach          		D．used            
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D．on their own    
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D．decrease        
D．pass on          
D．process          
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