题目内容
（请给出正确答案）
A、gene on the X chromosome that is responsible for female development.
B、patch of cells that has a phenotype different from surrounding cells because of variable X inactivation.
C、inactivated X chromosome, visible in the nucleus of a cell that is normally from a female mammal.
D、extra X chromosome in a cell that is the result of nondisjunction.
E、extra Y chromosome in a cell that is the result of nondisjunction.
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更多“A Barr body is a（n):”相关的问题
此题为判断题(对，错)。
A、M, N and α
B、M, N and β
C、α,β1 and β2
D、M, α and β
E、M, β1 and β2
A、beaucoup; assez
B、trop ; un peu
C、trop de ; assez de
D、très ; beaucoup
B．Classification
C．Cause and effect
D．Exemplification
| 阅读理解。 |
| We know the famous ones-the Thomas Edisons and the Alexander Graham Bells-but what about the less famous inventors？ What about the people who invented the traffic light and the windshield wiper (雨刮器)？ Shouldn't we know who they are？ Joan Mclean thinks so. In fact, Mclean, a professor of physics at Mountain University in Range, feels so strongly about this matter that she's developed a course on the topic. In addition to learning "who" invented "what", however, Mclean also likes her students to learn the answers to the "why" and "how" questions. According to Mclean, "When students learn the answers to these questions, they are better prepared to recognize opportunities for inventing and more motivated to give inventing a try." So,just what is the story behind the windshield wiper？ Well, Mary Anderson came up with the idea in 1902 after a visit to Mew York City. The day was cold and stormy, but Anderson still wanted to see the sights, so she jumped aboard a streetcar. Noticing that the driver was struggling to see through the snow covering the windshield, she found herself wondering why there couldn't be a buolt-in devic for cleaing the window. Still wondering about this when she returned home to Birmingham, Alabama, Anderson started drafting out solutions. One of her ideas, a lever (操作杆) on the inside of a vehicle that would contral an arm on the outside, became the first windshield wiper. Today we benefit from countless inventions and innovations,It's hard to imagine driving without Garrett A. Morgan's traffic light. It's equally impossible to picture a world without Katherine J. Blodgett's innovation that makes glass invisible. Can you picture life without clear windows and eyeglasses？ |
| 1. By mentionong "traffic light" and "windshield wiper", the author indicates that countless inventions are _____. |
| A. beneficial, because their inventors are famous B. beneficial, though their inventors are less famous C. not useful, because their inventors are less famous D. not useful, though their inventors are famous |
| 2. Professor Joan McLean's course aims to _____. |
| A. add colour and variety to students' campus life B. inform students of the windshield wiper's invention C. carry out the requirements by Mountain University D. prepare students to try theie own invention |
| 3. Tommy Lee's invention of the unbreakable umbrella was _____. |
| A. not eventually accepted by the umbrella producer B. inspired by the story behind the windshield wiper C. due to his dream of being caught in a rainstorm D. not related to Professor Joan McLean's lectures |
| 4. Which of the following can best serve as the title of this passage？ |
| A. How to Help Students to Sell Their Inventions to Producers？ B. How to Design a Built-in Dervice for Cleaning the Window？ C. Shouldn't We Know Who Inventd the Windshield Wiper？ D. Shouldn't We Develop Invention Courses in Universities？ |
A、papilloma viruses
B、Epstein-Barr viruses
C、retroviruses
D、hepatitis B viruses
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