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下列有关细胞结构和功能的说法错误的是（ ）A.细胞膜主要由磷脂和蛋白质组成，功能复杂的细胞膜上蛋白质的种类和数量较多B.能将染色质染成深色的物质有醋酸洋红、龙胆紫和改良苯酚品红溶液等碱性染料C.细胞核是控制细胞代谢活动的中心，也是细胞物质代谢和能量代谢的主要场所D.染色体和染色质是同一种物质在不同细胞分裂时期的两种形态，严格地说，只在细胞分裂时才出现染色体20、Laptop computers are popular all over the world. People use them on trains and airplanes, in airports and hotels. These laptops connect people to their workplace. In the United States today, laptops also connect students to their classrooms.     Westlake College in Virginia will start a laptop computer program that allows students to do schoolwork anywhere they want. Within five years, each of the 1500 students at the college will receive a laptop. The laptops are part of a $10 million computer program at Westlake, a 110-year-old college. The students with laptops will also have access to the Internet. In addition, they will be able to use E-mail to “speak” with their teachers, their classmates, and their families. However, the most important part of the laptop program is that students will be able to use computers without going to computer labs. They can work with it at home, in a fast food restaurant or under the trees- anywhere at all!     Because of the many changes in computer technology, laptop use in higher education, such as colleges and universities, is workable. As laptops become more powerful, they become more similar to desktop computers. In addition, the portable computers can connect students to not only the Internet, but also libraries and other resources. State higher-education officials are studying how laptops can help students. State officials are also testing laptop programs at other universities too.     At Westlake College, more than 60 percent of the staff use computers. The laptops will allow all teachers to use computers in their lessons. As one Westlake teacher said, “Here we are in the middle of Virginia and we’re giving students a window on the world. They can see everything and do everything.” 66. The main purpose of the laptop program is to give each student a laptop to ____________. A. use for their schoolwork                               B. access the Internet C. work at home                                                     D. connect them to libraries 67. Why is the word “speak” in the second paragraph in quotation marks (引号)? A. They don’t really talk.                                          B. They use the computer language. C. Laptops have speakers.                                        D. None of the above reasons is correct. 68. Which of the following is true about Westlake College? A. All teachers use computers.                                  B. 1500 students have laptops. C. It is an old college in America.                       D. Students there can do everything. 69. “A window on the world” in the last paragraph means that students can __________. A. attend lectures on information technology       B. travel around the world C. get information from around the world           D. have free laptops 70. What can we infer from the passage? A. The program is successful.                                  B. The program is not workable. C. The program is too expensive.                       D. We don’t know the result yet. 评卷人 得分 四、短文改错 （每空？ 分，共？ 分）