植物细胞中的能量转换结构包括（） A．叶绿体 B．细胞核 _爱下问搜题

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问题选择题

植物细胞中的能量转换结构包括（）

A．叶绿体

B．细胞核　　

C．线粒体　　

D．细胞膜

答案

AC

题目分析：叶绿体中的叶绿素能吸收光能，将光能转变为化学能，储存在它所制造的有机物中；线粒体能将细胞中的有机物在氧的参与下分解为二氧化碳和水，同时将有机物中的化学能释放出来，供细胞利用．动物是异养的，其细胞内不含能够进行光合作用的叶绿体，只有线粒体．绿色植物的细胞内含有两种能量转换器：叶绿体和线粒体，叶绿体是植物细胞特有的能量转换器．而叶绿体只存在于植物体的绿色部位。故AC正确．

单项选择题

GPON技术中，OLT下行采用（）技术进行数据下发。

A.广播

B.单播

C.链路复用

D.TDMA

完形填空

It’s only after three weeks into a new job that I made a serious mistake. My boss called it “extremely embarrassing” in a company-wide e-mail — which,    31  , he wrote because he felt he needed to explain that what I did was something    32  in the company should ever do.
I wish I   33   give a good excuse for what I did. At the very least, I wish I could explain it somehow —    34  it on youth, inexperience or ignorance. Unfortunately, I’m    35  , experienced and I know better.
   36  I work with some very kind and compassionate(富于同情心的) people. For the past couple of days many of them have taken time to   37  by my desk and offer comfort, encouragement and support. Some have shared with me similar    38  they have made. Evidently I’m not the only “    39   ” person here.
One of the exchanges I had this week was with Lois, the much-honored, much-respected professional who    40  the desk right next to mine. Lois was completely    41  about her work, and to be honest I was a little nervous about how she would   42  to such an extremely embarrassing incident.
As I expected, Lois didn’t pass over the   43   when she saw me the next day. She mentioned it directly,   44  with empathetic consideration. She listened to my   45  . Just as I was ready to express my regrets, she brought my self-pity partly to a(n)   46  .
“It happened”, she said, “There’s nothing you can do to    47  that. It happened. But it’s over now. It’s   48  . It’s in the past. You need to let it go, and move on.” And with that she returned her   49  to her work, as if to say, “We’re done here.”
I beat myself up for weeks. At such times I need to remember those   50  words: It’s over. It’s done. Let it go. And mostly, move on.

C．embarrassing

B．imagination

D．explanation