运用论辩的方法进行说明，应遵循的原则和要求？

冠状动脉造影的主要并发症为（）、（）、（）、（）、（）。

醋酸纤维素薄膜电泳常用缓冲液的pH值为（）

A.7.35

B.8.00

C.8.20

D.8.40

E.8.60

物质发生化学变化的前后，总质量是否发生改变?是增加、减小还是不变?小刘、小李按下面步骤进行探究，反应方程式为：BaCl₂+Na₂SO₄==BaSO₄↓+2NaCl      Na₂CO₃+2HCl==2NaCl+H₂O+CO₂↑

（1）提出假设：物质发生化学变化前后总质量不变。

（2）设计并进行实验：小刘设计的实验装置和选用药品如A所示，小李设计的实验装置和选用药品如B所示，他们在反应前后都进行了规范的操作、准确的称量

（3）实验结论：小刘认为：在化学反应中，生成物的总质量与反应物的总质量相等；小李认为：在化学反应中，生成物总质量与反应物的总质量不相等。你认为                     的结论正确，导致另一个实验结论错误的原因是：                                          请从原子的角度分析你认为正确的结论的原因：                

（4）使用上述实验装置，请你选择另外两种药品进行实验达到实验目的，这两种药品可以是____和 _______(填化学式)[注：以上四种药品均不能再用]

（5）小刘和小李通过查阅资料了解到:法国伟大的科学家拉瓦锡早在18世纪就围绕这个问题进行了准确、缜密的研究，并作出了科学的结论。请你简要谈一下你对这条科学结论有什么重大意义？（不超过30字）__________________________________________________。

治疗旋毛虫病的常用药物为

A．青蒿素和青蒿琥酯

B．阿苯达唑和甲苯达唑

C．吡喹酮

D．氯喹

E．激素

Intellectual property (IP) is a product of the mind that has commercial value. The concept dates back to 1623, when the first patent law to protect IP rights was passed. IP rights protect an artist from having his/her creative ideas copied by another. For example, if somebody generated an idea for a novel, that idea is protected by IP rights. If someone else wishes to represent the idea or develop it further, he/she must consult the original artists, who will normally be rewarded financially for its use. Back in the 17^th century, IP rights were primarily carried out to protect newly developed manufacturing processes against stealing, but today intellectual property rights are also enjoyed by those who create music, art and literature.

In recent years, IP rights have been the focus of a great deal of discussion because of a technology which looks set to weaken them altogether: the Internet. Many years ago, if you wanted a recoding of a song, you would have to purchase it from a music store; if a novel, from a book store. In those days, IP rights were easily protected since it was very difficult to obtain intellectual property without paying for it. However, a lot of IP, including songs, films, books and artwork, can be downloaded today free of charge using the internet. This practice has now taken the world by storm, dramatically affecting the way in which we view IP rights.

小题1:According to the writer, in the beginning, IP rights were mainly of use to _______.

A．those creating music, art and literature

B．novelists

C．those not receiving financial reward for their work

D．engineers and inventors小题2:What do we know about the Internet according to the passage?

A．It does not affect the way we understand IP rights.

B．It sells songs and films.

C．It makes IP rights harder to protect.

D．It prevents the production of artwork.小题3:According to paragraph 2, what has “taken the world by storm”?

A．Intellectual property rights.

B．Free downloading.

C．The Internet.

D．The large number of songs, films and books.小题4:A possible title for this passage could be _______.

A．IP Rights and Our Attitudes　

B．Ways to Protect Your IP Rights

C．The Present and the Future of IP rights

D．A History of IP Rights