如题图所示的山墙，采用MU10的烧结多孔砖，M2.5的混合砂浆砌筑，带壁柱墙的折算厚

脂肪坏死有________和________两大类。

The United States economy has dipped into economic recession (经济衰退). This caused discomfort and hardship in every level of society; but for many of the nation’s poor, discomfort and hardship turned into misery (苦难).

An increase in homelessness is probably the worst result of a nation’s financial disaster. About 3 million Americans were homeless because of a lack of affordable housing. Experts suggest that a family should spend no more than 30 percent of its income on housing. In fact, in some families housing costs make up 50 percent or more. An unexpected event, such as losing work or illness, can quickly push a family into homelessness.

An article in Time magazine tells a story of one such family. A young couple and their three children rented a two-bedroom apartment for about $350 a month. They could hardly go on with the husband’s $920-a-month take-home pay; so when their rent was raised to $500 a month, they could no longer make ends meet.

Another woman was found dead on a street in Washington D.C., the capital, and she died at a bus-stop across the street from the US Department of Housing and Urban Development.

People become homeless for different reasons. Some may not be able to pay for housing, because they have lost their job and cannot find another place they can afford. Others have mental diseases, or are addicted to drugs or alcohol, many of whom do not live with their family. And what’s more, there are not enough centers for shelter as the government doesn’t pay enough attention to this social problem. 

People are making efforts to solve the problem. However, it will not be easy, because it is a personal and economical problem as well as a social problem.

小题1:The passage is mainly about __________ in the US.

A．ways of solving economic problems

B．homeless people being taken good care of

C．different reasons for economic recession

D．economic recession leading to social problems小题2:In the passage the author supported his view by __________.

A．presenting specific figures

B．giving examples

C．explaining in details

D．discussing different opinions小题3: One main result that economic recession has led to is __________

A．an increase of living costs

B．more and more deaths

C．an increase of homeless people

D．less centers for poor people小题4:How many reasons why people become homeless are listed in the passage?

A．2.

B．3.

C．4.

D．5.

建筑变形缝中，伸缩缝的作用是( )。

A．使结构形体刚度均
B．防止房屋产生不均匀沉降
C．防止房屋因气温变化而产生裂缝
D．使结构伸缩自如

关于细菌的形态和大小的描述，以下正确的是（）。

A、细菌的形态包括球菌、杆菌、螺旋菌、丝状菌。

B、杆菌有长杆菌、短杆菌、弧杆菌、链杆菌和芽孢杆菌之分。

C、在任何情况下，细菌的形态都是稳定的。

D、多数球菌的直径为0.5~2.0μm。

清理工件上的铁屑时为什么必须停车，并使用专用工具？