台式计算机中经常使用的硬盘多是______英寸。A．5.25 B．3.5 C．2.5

WeChat (微信)  was put into market in January 21, 2011. Because of its attractive functions(功能),low cost and convenience, it becomes a hot free software. You can see people around you using WeChat to talk with their friends now. They are especially students in high schools and universities. The other users are workers. The age range is from ten to sixty years old. Most people may become WeChat users.

WeChat supports Wi-Fi and 3G network. It can enjoy group chat up to 20 people. What's more, WeChat can search people around you. It also supports to send video. You can share the wonderful pictures with other people at any time. It can share your messages to the world and make new friends. WeChat not only can keep your pictures and texts in a way, but also can help you to catch your messages. WeChat makes two people "talk" with each other in different places and at different time. People believe that there will be many other functions created in the future.

The cost of WeChat is very low. It costs nothing to own WeChat if you have a phone such as Nokia

Motorola, Lenovo. However, it costs web traffic (流量) to send and receive messages. It is enough to spend ten yuan on your web traffic for a month. The low cost is one of the main reasons why WeChat becomes popular.

小题1:WeChat was created after January 21, 2011.

小题2:Most people may become WeChat users except the old people.

小题3:WeChat won't be created with other functions in the future.

小题4:You can use WeChat to talk with twenty people at the same time by smart phone.

小题5:The cost of WeChat is very low, but the web traffic cost is very high.

（6分）图中甲是小明探究“水的沸腾”的实验装置．当水温上升到90℃时，每隔1min记录一次温度计的示数，得到如下数据，请根据表格中的数据，回答下列问题：

时间t/min	0	1	2	3	4	5	6	7	8
温度t/℃	90	95	98	100	101	102	102	102	102

（1）图甲中温度计的示数为    ℃．图乙中，表示水在沸腾时气泡的现象是其中的    图；

（2）根据实验数据，在图丙中作出水的温度随时间变化的图像；

（3）水在沸腾过程中，需要吸收热量，温度    （选填“升高”、“不变”或“降低”）；

（4）小明发现撤掉酒精灯时，烧杯内的水没有立即停止沸腾，你认为可能的原因    （写出一条即可）．

（16分）阅读材料，回答问题。

【材料一】 第二年（1922年），社会景况顿然改观。街市上人山人海，农家妇女、老人、工人、学生……种种色色人簇拥在一处。这里一批白面包、香肠、火腿、牛奶、糖果点心，那里一批小褂、绒裤、布匹……政府与农民的关系也得到了缓和，商业也活跃了起来。

——据瞿秋白1920年12月到1922年12月在苏俄考察的记载

【材料二】 一位年轻的记者曾经问富兰克林·罗斯福：“你是 * * 党吗？”“不是。”“你是社会主义者吗？”“不是。”……“那你的哲学是什么？”“哲学？我是基督教徒，是民主党人，如此而已”

——据内森·米勒《罗斯福正传》

(1)据材料一，指出苏俄社会状况“改观”的表现。苏俄社会状况的改观与哪一政策的实施相关？（6分）

(2)材料二中记者问罗斯福是否“社会主义者”的原因是什么？罗斯福新政的实质是什么？（6分）

(3)苏俄和美国的政策调整，对我们今天的改革与建设有何重大启示？（4分）

每一个起动手柄，共操纵多少个电门？（）

A.4个

B.6个

C.8个

D.10个

设计行车速度200～250km/h（不含）区间正线最大坡度不应大于（）。