Given BC=1,in a triangle（三角形）ABC, then the range of length of the side AB (or AC) is_____________________。
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科目：高中英語 來源：2011-2012學(xué)年河北省高三第三次調(diào)研考試生物試卷 題型：選擇題

全能干細(xì)胞能夠讓植物在整個(gè)生命周期中產(chǎn)生新的器官，是植物生長發(fā)育的源泉和信號(hào)調(diào)控中心，但是到目前為止，人們對于干細(xì)胞組織中心建立和維持的機(jī)制仍然知之甚少。中國科學(xué)院遺傳與發(fā)育生物學(xué)研究所的李傳友課題小組發(fā)現(xiàn)了一個(gè)在植物根尖干細(xì)胞維持中起重要作用的基因，這一研究結(jié)果于2010年11月3日作為封面文章發(fā)表于國際著名雜志The   Plant  Cell上。下列說法不正確的是（    ）

A．植物全能干細(xì)胞分化形成不同組織細(xì)胞是基因選擇性表達(dá)的結(jié)果

B．植物全能干細(xì)胞有細(xì)胞周期，全能干細(xì)胞分化形成的導(dǎo)管細(xì)胞沒有細(xì)胞周期

C．植物全能干細(xì)胞分化形成根、莖、葉的過程一般是不可逆的

D．植物全能干細(xì)胞分化形成根、莖、葉的過程體現(xiàn)了細(xì)胞的全能性

 

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科目：高中英語 來源： 題型：閱讀理解

For the past six weeks I have been having online writing classes. I had never taken an online class before, so I did not know what to expect. Now I am about halfway through the courses, and I am doing three courses, where I am practicing writing.

These creative writing classes have been somewhat similar to those I took in a middle school. There are weekly readings where we have to discuss our thoughts, and we comment on each other’s work. But there are some differences. In my middle school, I had one novel writing class where we all sat in a circle twice a week and discussed each other’s work. Each person had a copy of the story but the author of the story was always anonymous(匿名的). This allowed people to give honest opinions since there was no face to connect the story to.

The creative article course is held in a computer lab and all of our work is done online. Every week, two people read their stories aloud to the class, and then we spend a few minutes discussing them, and then post comments on the online discussion board. Still, the main benefit of an online class is that I can choose when to turn in my homework. This allows me to choose how to manage my time.

 I think taking three creative writing courses at one time may have been a little too ambitious, but I am studying a variety of writing styles and I think I am becoming a better writer for it.

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C. About six months.                  D. About six weeks

What do the author’s online classes and school classes have in common?

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B. Students sit in a circle twice a week.

C. Students write novels every day.

D. Students discuss their reading every week.

Why was the author of the story anonymous during the discussion?

A. Because students didn’t want their work popular.

B. Because in this way students could express their real ideas freely.

C. Because students didn’t know each other at all.

D. Because it took students less time to finish the discussion.

What is the main advantage of taking online writing classes?

A. Students needn’t have face-to-face talks.

B. Students can hand in their homework late.

C. Students can arrange their time as their like.

D. Students needn’t do any homework.

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科目：高中英語 來源： 題型：

The books, _____ the dictionaries, must be put back where they _____.

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科目：高中英語 來源：2011—2012學(xué)年遼寧省瓦房店市高級(jí)中學(xué)高二上學(xué)期期末考試生物試卷 題型：單選題

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科目：高中英語 來源：不詳 題型：單選題


Suppose  the  least distance fron poinrs of the xurve(曲線)to the y-axis is then the velue of a is
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Ahyperbola(雙曲線)wjthvertices(頂點(diǎn))（-2，5）and(-2,-3),has  an  asynptote(漸近線)that passes  the   point(2.5)  Then  an  equarionk  of  the  hyperbola  is
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下面是將兩個(gè)數(shù)中最大者打印出來的一段程序，請把程序補(bǔ)充完整.

    Input “A= ”；A

    Input “B= ”；B

    max=A

    If____________________ then

    max=B

    End if

    Print “The max is”；max

    End

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