若一年内的计息期数m＞1，则名义利率（）实际利率。A．大于 B．小于 C．等于 D．

向某密闭容器中加入0.3 mol A、0.1 mol C和一定量的B三种气体。一定条件下发生反应，各物质的浓度随时间变化如甲图所示[t₀～t₁阶段的c(B)变化未画出]。乙图为t₂时刻后改变条件平衡体系中正、逆反应速率随时间变化的情况，且四个阶段都各改变一种反应条件且互不相同，t₃～t₄阶段为使用催化剂。下列说法中正确的是

A．若t₁＝15 s，用A的浓度变化表示t₀～t₁阶段的平均反应速率为0.004 mol·L^－1·s^－1

B．该容器的容积为2 L，B的起始物质的量为0.02 mol

C．t₄～t₅阶段改变的条件一定为减小压强

D．t₅～t₆阶段，容器内A的物质的量减少了0.06 mol，而此过程中容器与外界的热交换总量为a kJ，该反应的热化学方程式：3A(g)B(g)＋2C(g)　ΔH＝－50a kJ·mol^－1

根据分子和结构不同，RNA可以分为________、________、________、________。

In 2006, a large number of new Internet sites became popular around the world. Some of these are for communication, others for entertainment.

The blog is one form of communication that increased in popularity. Through these personal websites, people can share their lives, ideas and opinions on the Internet. People of all ages have their own blogs. For young people, they are a way to show their writing and other forms of self-expression. Blogs also connect people with other people who have the same interests. For example, teachers use blogs to share ideas with other teachers’, as well as experiences and concerns about their work.

YouTube is another Internet site that became more popular last year. This website lets anyone create, share and watch short videos. These include videos of people singing or dancing, or animals doing funny things. Three young men created YouTube almost two years ago as a personal video sharing service. They recently sold it to Google for more than one and a half billion dollars.

Games and entertainment also became a larger part of the Internet last year. One Internet social site is called Second Life. It is an online world in which computer users create a new self and live a different life. They get married, build homes, operate businesses, buy and sell goods, work, play and attend school.

People also take part in fantasy sports leagues with the help of the Internet. A fantasy sport is a game in which each member of a group acts as the owner of a team. Each owner creates a team of real-life professional players to compete against other teams in the league. More than fifteen million American adults play fantasy sports. The industry earns more than one billion dollars each year from publications, memberships and other costs.

小题1:The passage is mainly about __________.

A．the most popular Internet technology in 2006

B．some new ways for people to communicate or have fun on the Internet

C．one online game called Second Life

D．the high price of playing online小题2:Who is the owner of YouTube now?

A．Three young men.

B．Google.

C．Computer users.

D．Yahoo.小题3: Whom does the underlined word “they” in Paragraph 4 refer to?

A．The people who are interested in blogs.

B．The people who play games on YouTube.

C．The people who play Second Life.

D．The people who are created in Second Life.小题4: What do we know from the passage?

A．Teachers can share ideas, experiences and concerns about their work with other teachers on any website.

B．More than fifteen million American teenagers play fantasy sports.

C．Second Life helps people get married, buy and sell goods, work, play and attend school in real life.

D．Fantasy sports, a game in which each member of a group acts as the owner of a team, is very popular around the world.

脊柱结核，X线表现为

A．患病椎体之间的椎间隙变窄，骨性融合

B．脊柱呈竹节样、骨质疏松、多数伴有骶髂关节炎病变

C．一般先影响关节边缘，引起破坏、不规则以及关节间隙变狭窄，然后死骨形成，椎旁并有肿块阴影

D．一般影响多个椎体，椎体压缩，但不影响关节面

E．一般只影响单个椎体，椎体疏松、破坏或压缩