问题
选择题
下图①～④表示某细胞的部分细胞器，下列叙述正确的是
A．此细胞不可能是原核细胞，只能是动物细胞
B．结构①不能将葡萄糖分解成二氧化碳和水
C．结构①和④都存在碱基A和T的互补配对
D．如果该细胞为胰岛B细胞，则胰岛素合成时，其空间结构的形成不可能发生在③结构上
答案
答案：B
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下图①～④表示某细胞的部分细胞器，下列叙述正确的是
A．此细胞不可能是原核细胞，只能是动物细胞
B．结构①不能将葡萄糖分解成二氧化碳和水
C．结构①和④都存在碱基A和T的互补配对
D．如果该细胞为胰岛B细胞，则胰岛素合成时，其空间结构的形成不可能发生在③结构上
答案：B
请先阅读下面短文，掌握其大意，然后根据短文内容从下面方框内的七个选项中，选择五个还原到文中，使短文意思通顺、结构完整。  You have been thinking about it all week. It kept you awake last night. Now, as you walk to the front of the class, your throat is dry and your stomach feels funny. 81. __________________________ However, by making a few small preparations and rehearsing (预演) carefully, you too can be a public speaking star. 82. __________________________ Being excited about your topic is necessary for all the good speeches, so it's important to choose carefully. If you enjoy your topic, your audience (观众) will, too. Even if you are given a topic, try to find something about it that is exciting or funny. Next, do some research. Don't just research your topic. 83. _________________________ If you can, study video of a great speaker to see how they move, speak, and pause (停顿). Copying their style will help you to write a great speech. After researching, it's time to write your speech. During this stage, think of your audience all the time. 84. __________________________ It helps you relax if you know that your audience is enjoying your speech. Finally, rehearse. You really need to rehearse a lot. Measure your speech with a watch, and practice in front of a mirror (镜子). 85. __________________________ If you have followed all these steps, you should be ready for your audience. Good luck!
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