13．I passed all the other courses that I took at my university，but I could have never passed botany．This was because all botany students had to spend several hours a week in a laboratory looking through a microscope at plant cells，and I could never once see a cell through a microscope．This used to make my professor angry．He would wander around the laboratory pleased with the progress all the students were making in drawing the structure of flower cells，until he came to me．I would just be standing there．"I can't see anything，"I would say．He would begin patiently enough，explaining how anybody can see through a microscope，but he would always end up angrily，claiming that I could too see through a microscope but just pretended that I couldn't．"It takes away from the beauty of flowers anyway．"I used to tell him．"We are not concerned with beauty in this course，"he would say．"We are concerned with the structure of flowers．""Well，"I'd say．"I can't see anything．""Try it just once again，"he'd say，and I would put my eye to the microscope and see nothing at all，except now and again something unclear and milky．"You were supposed to see a clear，moving plant cells shaped like clocks．""I see what looks like a lot of milk．"I would tell him．This，he claimed，was the result of my not having adjusted the microscope properly，so he would readjust it for me，or rather，for himself．And I would look again and see milk．
I failed to pass botany that year，and had to wait a year and try again，or I couldn't graduate．The next term the same professor was eager to explain cell-structure again to his classes．"Well，"he said to me，happily，"we're going to see cells this time，aren't we？""Yes，sir，"I said．Students to the right of me and to the left of me and in front of me were seeing cells； what's more，they were quietly drawing pictures of them in their notebook．Of course，I didn't see anything．
So the professor and I tried with every adjustment of the microscope known to man．With only once did I see anything but blackness or the familiar milk，and that time I saw，to my pleasure and amazement，something like stars．These I hurriedly drew．The professor，noting my activity，came to me，a smile on his lips and his eyebrows high in hope． He looked at my cell drawing．"What's that？"he asked．"That's what I saw，"I said．"You didn't，you didn't，you didn't!"he screamed，losing control of himself immediately，and he bent over and looked into the microscope．He raised his head suddenly．"That's your eye!"he shouted．"You've adjusted the microscope so that it reflects!You're drawn your eye!"
21．Why couldn't the writer see the flower cells through the microscope？C．
A．Because he had poor eyesight
B．Because the microscope didn't work properly
C．Because he was not able to adjust the microscope properly
D．Because he was just playing jokes on his professor by pretending not to have seen it
22．What does the writer mean by"his eyebrows high in hope"in the last paragraph？A
A．His professor expected him to have seen the cells and drawn the picture of them
B．His professor hoped he could perform his task with attention
C．His professor wished him to learn how to draw pictures
D．His professor looked forward to seeing all his students finish their drawings
23．What is the thing like stars that the writer saw in the last paragraph？B
A．Real stars
B．His own eye
C．Something unknown
D．Milk
24．In what writing style did the writer write the passage？D
A．Realistic
B．Romantic
C．Serious
D．Humorous．
分析 本文讲述了作者通过了大学的所有其他课程，但可能从来没有通过植物学，这是因为所有的植物学学生都要花几个小时在一个实验室，通过显微镜观察植物细胞，但作者通过显微镜却从来没有见过一个细胞．这是为什么呢？
解答 21．C 细节理解题．根据第一段的This，he claimed，was the result of my not having adjusted themicroscope properly他声称，这是我没有正确调整显微镜的结果，可知作者通过显微镜看不到花的细胞是因为因为他不能正确地调整显微镜，故选C．
22．A 推理判断题．结合选项可知是教授的期望．作者因不能正确使用显微镜而考试不及格，教授自然希望作者能和其他学生一样，正确调节显微镜，能看到细胞并画出细胞的图片，故选A．
23．B 细节理解题．根据最后一段的He raised his head suddenly．"That'syour eye!"he shouted．"You've adjusted the microscope so that itreflects他突然抬起头来，"那是你的眼睛！"他喊道，"你调整了显微镜这样反射了你的眼睛，可知作者看到的像星星的东西是他自己的眼睛，故选B．
24．D 写作风格题．根据第一段的and I could never once see a cell through amicroscope．我通过显微镜却从来没有见过一个细胞以及整篇文章用词和作者语气可看出作者的"幽默诙谐"．故选D．
点评 本文是人物故事类阅读，考查学生的细节理解和推理判断能力．做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确选择．在做推理判断题时不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．
