下列有关氢化物的叙述中正确的（） A、稳定性：H2S>HF B、 HCl的电子式

阅读下面短文，完成相关任务。

Microsoft has stopped providing service for Windows XP since April 8,2014. Microsoft has provided support for Windows XP for the past 12 years. 【1】The computers that use the XP system are not as safe as before.

The "demise"(停用) of Windows XP will have the greatest influence on China because it has about 210 million XP users, who make up about 70.percent of the PC market in the world. Microsoft's decision to "kill" Windows XP, a product with hundreds of millions of users, has a certain purpose to show its strong position in the operating system market.

At the same time, the "death" of XP has created opportunities for China's IT companies to grow and develop. China can break the monopoly(垄断)of international IT giants and protect the internet security(安全) by having information technology and a policy that encourages innovation.

小题1:把划线部分翻译成汉语：                                            

根据短文内容回答第2—4题：

小题2:In which year, Windwos XP started to provid support?

小题3:According to the passage,how many XP users are there in the world?

小题4:How can China break the monopoly of international IT giants and protect the internet security? 

小题5:What is the main idea of the passage?   

A．How to protect our XP system?

B．How to change your computer?

C．Why did Mirosoft stopped providing service for Windows XP

D．The influenc about the “demise” of Windows XP.

图像与文字一样承载着历史，一图胜千言。下列图片能为我们研究商朝历史提供依据的是                                                        （  ）

A．①②③

B．②③④

C．①③④

D．①②④

将一个标有“36V 18W”的灯泡接入某电路中，测得通过灯泡的电流为0.3A，那么它的实际功率将[ ]

A．小于18 W

B．大于18 W

C．等于18 W

D．无法判断

脑血栓形成的最常见原因是（）

A.高血压

B.先天性血管畸形

C.高脂血症

D.脑动脉粥样硬化

E.结缔组织病

地面点的标志，按保存时间长短可分为临时性标志和永久性标志。