“人类基因组计划”目的是要测定人类多少条染色体的DNA分子中的全部基因( ) A

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问题:

“人类基因组计划”目的是要测定人类多少条染色体的DNA分子中的全部基因(  )

A.22条

B.24条

C.23条

D.46条

考点:人的性别遗传
题型:选择题

阅读理解。根据短文内容用适当的单词完成下面句子。

Dear Mike,

     We got your letter yesterday. Yes, we can visit you at Christmas. We thought to spend (度)Christmas

  at home, but now we are going to be with you. Jack will not be in school then.    

     The weather in Chicago is cold, but it doesn't matter. Sometimes we like the snow.

     We got our plane tickets. We will get to your city on the 18 th. We will stay with you for two weeks.

 Is that all right with you?

     We'll  take our favourite recipes (食谱), so we can have a nice Christmas dinner.

     See you soon.

                                                                                                                                  Love

                                                                                                                                Mum and Dad

1. In Chicago, it is _____ now.

2. Mike has a brother called _____ .He is in school now.

3. Mike's parents will go to his city by _____ .

4. His parents will come back on _____ 31 st.

5. Mike and his parents will _____ a nice dinner on Christmas Day.

题型:选择题

查找文件或文件夹时,可以使用的通配符是_____。

A.

B.!

C.……

D.%

题型:选择题

社会存在与社会意识的关系问题是历史唯物主义的基本问题。下列属于社会存在的是( )

①以公有制为主体、多种所有制经济共同发展的基本经济制度

②江 * * 同志提出的“致富思源、富而思进”的思想

③当前经济转轨过程中涌现出来的个人主义

④建设中国特色的社会主义的伟大实践

A.

①②

B.

①④

C.

②③

D.

②③④

题型:选择题

据以确定风险的大小或高低,并作为风险衡量的主要测算指标的是损失概率和()

A.损失性质

B.损失原因

C.损失程度

D.损失结果

题型:选择题

如图所示,一端封闭的U形管中,水银柱封闭了一段L1=19cm长的空气柱,水银柱两侧水银面的高度差h=4cm,右侧水银面距开口端L2=20cm,当U形管竖直放置自由下落时,两侧水银面的高度差为h'应为______cm,如将右端口封闭后,再让它自由下落,这时两侧水银面的高度差h″应为______cm,(大气压强为76cmHg)

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