题目

Men have always believed that they are smarter than women. Now, a study has found that while this is certainly true, men also have to deal with the fact that they are also more stupid than the fairer sex. In the study, scientists measured the IQ of 2500 brothers and sisters and they found an uneven number of men not only in the top two percent, but also in the bottom two percent. The study's participants were tested on science, maths, English and mechanical abilities. Though there were twice as many men as women in the smartest group, there were also twice as many men among the dolts. The aggr下图为植物细胞模式图，根据图回答下列问题（1）请写出各部分的名称【3】____________【4】___________【5】_________（2）在显微镜下观察洋葱表皮细胞，最外层是一层透明的薄壁。叫[ ]______起______和______细胞作用。（3）在光学显微镜下，植物细胞中有一层结构看不清楚，这层结构叫[ ]_________。（4）植物细胞中的叶是绿色的，主要是因为细胞中含有[ ] ________。（5）人体与动物细胞在形态结构上不一样，但都具有__________、__________和________等基本结构，与人体细胞相比，植物细胞有哪些特殊的结构__________、_________和________。（填结构名称）