若|a|=7，b=36，则ab＜0，则a-b=______．

Researchers at Yale, Texas A&M and Boston University predict that by 2030 urban areas will expand by more than 463,000 square miles, or l．2 million square kilometers． That is equal to 20,000 American football fields becoming urban every day for the first three decades of this century．

The growth in urban areas will go with the construction of roads and buildings, water and sanitation facilities, and energy and transport systems that will transform land cover and cities globally． Recent estimates suggest that between $25 trillion（万亿） and $30 trillion will be spent on infrastructure（基础设施） worldwide by 2030, with $100 billion a year in China alone．

"Considering the long life and near unavoidability of infrastructure investments, it will be critical for current urbanization-related policies to consider their lasting impacts," said Karen Seto, lead author of the study． "We have a huge opportunity to shape how cities develop and their environmental  impacts．"

Nearly half of the increase in high-probability ----defined as greater than 75 percent ---- urban expansion is forecasted to occur in Asia, with China and India absorbing 55 percent of the regional total． In China, urban- expansion is expected to create a l,l00-mile coastal urban corridor from Hangzhou to Shenyang． In India, urban expansion will be gathered around seven state capital cities, with large areas of low-probability growth forecasted for the Himalaya region where many small villages and towns currently exist．

Africa's urban land cover will grow the fastest, at 590 percent above the 2000 level of 16,000 square miles． Urban expansion win be concentrated in that continent's five regions: the Nile River in Egypt; the coast of West Africa on the Gulf of Guinea; the northern shores of Lake Victoria in Kenya and Uganda and extending into Rwanda and Burundi; the Kano region in northern Nigeria; and greater Addis Ababa, Ethiopia．

"Urban expansion is concentrated in． only a few areas where there are large cities and industry," said Seto． "From the northern shore of Lake Victoria down to Rwanda is also a major hotspot of urban expansion．"

In North America, where 78 percent of the total population lives in urban areas, urban land cover will nearly double by 96,000 square miles by 2030．The study also forecasts that 48 of the 221 countries in the study will experience insignificant amounts of urban expansion． "

小题1:As for China, the expansion of urban area means          ．

A．$ 100 billion will be spent on infrastructure a year

B．creating a coastal urban corridor from Hangzhou to Qingdao

C．it will become the fastest developing country in the next decade

D．it will make up 55% of the increase in urban expansion in Asia小题2:According to the passage infrastructure doesn't include          ．

A．construction of roads

B．sanitation facilities

C．energy systems

D．land cover transformation小题3:In paragraph three the underlined word “their lasting impacts” refers to the impacts of           .

A．the development of cities

B．urbanization-related policies

C．infrastructure in vestments

D．China’s expansion of urban area小题4:The best title for this passage should be                  .

A．The limitation of urban expansion

B．More investment on infrastructure

C．The fast development of the third world

D．The future urban expansion of the world

目前，雷电探测站的有效探测半径（平原地区）可达：（）。

A、100km

B、200km

C、300km

D、400km

下面哪一项是中国建筑业的最高奖项？（）

A.最高科学技术奖

B.金马奖

C.鲁班奖

D.金像奖

16岁的甲与13岁的乙是好朋友，均为中学生。某日二人在住宅小区中玩耍，一辆某快餐店的送餐车前来小区送餐停放在路边。甲对乙说：“我最讨厌这家快餐店了，上次去吃快餐，钱没带够被老板骂了一顿，你悄悄去把车上的广告画弄脏，给我出出气。”乙遂找来一块废金属片在车厢上乱刻一气。这时，快餐店送货员正好送货出来碰见，大声制止，乙慌忙逃跑，不小心撞上修电视机回来的丙，将丙的电视机撞翻在地。车身被划坏造成损失3000元，丙的电视机被撞坏造成损失1000元。请问：

对于丙的损失，责任由谁承担()

A．由乙的监护人承担

B．由甲自行承担

C．由乙的监护人与甲共同承担

D．由甲的监护人与乙的监护人共同承担

技术