细胞之间通过信息交流，保证细胞间功能的协调。下列关于图1、图2的说法错误的是
A．图1和图2中，B细胞与乙细胞上受体的化学本质是糖蛋白
B．图2可以表示精子与卵细胞的识别
C．若A细胞为胰岛B细胞，则胰岛素通过血液循环最终作用于机体的肝细胞、一般组织细胞等
D．若A细胞为内分泌腺细胞，则分泌的激素可以是性激素，靶细胞可以为神经细胞和性腺细胞等
答案：D
. 第四部分：任务型阅读 (10分) 认真阅读下列短文，并根据所读内容在文章后表格中的空格里填入一个最恰当的单词。 Speaking in public is most people's least favorite thing. The reason is that we are all afraid of making fools of ourselves. The more important the speech is, the more frightened we become. In fact, public speaking is not a "gift" like musical talent. Anybody who can talk can speak in public. Here are some of the lessons I have learned: Try to make your idea clear and brief. If you can't express what you intend to get across in a sentence or two, and then your speech is not focused well enough. If you don't have a clear idea of what you want to say, your audience will make no sense. After all, what you can impress your audience in your speech is one or two of your main ideas. One or two. Not ten or twenty. No matter how long or short your speech is, you've got to organize it well-how you are going to open, what major points you want to make and how you're going to close. A strong close is critical: the last thing you say is what your audience will most likely remember. When I do a radio or TV piece, I often write the last sentence first. When you know where you' re headed, you can choose any route to get there. Finally, you'd better limit the time of your speech as properly as you can to hold the audience's curiosity. Take a vaudeville act (杂耍) for example. The standard length of one is usually 12 minutes. Just imagine how you are feeling if you have been watching all the performers singing and dancing their hearts out for more than the standard time
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