由于液压油中含有金属颗粒而造成过度磨损信号包括（） A.液压系统过热运行 B.行程不

牙龈炎的临床病理特点，错误的是

A．初期病损以浆液渗出和多形核白细胞渗出为主，临床以龈沟液量增加为特征

B．早期病损以淋巴细胞浸润为主，临床可有探诊出血

C．确立期病损以浆细胞浸润为主，胶原纤维消失

D．确立期病损结合上皮显著增殖，但附着水平不变

E．确立期病损均可向深部发展，形成牙周袋和牙槽骨吸收

小宇在做“探究凸透镜成像规律”实验，其实验装置的示意图如图所示。a、b、c、d、e是主光轴上的五个点，F点和2F点分别是凸透镜的焦点和二倍焦距点。

（1）在a、b、c、d、e这五个点中：

①把烛焰放在________点，可以成正立放大的虚像。

②把烛焰放在________点，所成像最小。

③把烛焰放在________点上是照相机原理。

④把烛焰放在________点上是属于投影仪原理。

（2）小宇做完实验后，又想用手表代替蜡烛，看在光屏上能成什么样的像。于是他在透明的玻璃板上用黑色笔画了个手表盘，如图（甲）所示。把这个玻璃板放在蜡烛的位置上，并用平行光源对着玻璃板上的表盘照射，如图（乙）所示。移动光屏直到成清晰像为止。此时表盘在光屏上所成的像是图中的哪一个：

[ ]

A.

B.

C.

D.

社会保障制度建设是当今世界各国普遍关注的重大问题，美国罗斯福新政对此曾做了有益探索。阅读材料，回答问题。

材料一

1930年的美国失业者
经济萧条中饥饿的母亲
罗斯福与煤矿工人在一起

材料二 《全国工业复兴法》包括三方面内容：一是建立国家复兴管理局。二是由国家举办各种公共工程，减少失业大军。三是适当提高劳工地位，改善劳工待遇。劳工组织有与资方谈判的权利，雇主不得以工人参加何种工会作为雇佣条件，雇主必须遵守最高工时和最低工资限额，不得雇佣童工。

——苗枫林《世界改革史》

材料三 1933年5月通过《紧急救济法令》，到1936年止，政府大约支出30亿美元用于失业救济。1935年提出《社会保障法》，在全国范围内推行养老金制度和失业保险制度。

——高德步《世界经济通史》

（1）材料一反映了罗斯福关注什么社会问题？___________________________________________________________________________________________（2）材料二中有关社会保障的内容有哪些？《全国工业复兴法》旨在复兴美国工业，但为什么涉及社会保障问题？___________________________________________________________________________________________

（3）依据材料二、三，指出“新政”的社会保障制度主要是通过什么方式建立的。

___________________________________________________________________________________________

（4）关于“新政”中的社会保障措施，有人认为主要是为克服危机而采取的临时性措施，有人认为主要是为维护资产阶级民主制而进行的长期性制度建设。请选择你认同的一种观点并简要说明理由。

___________________________________________________________________________________________

阅读理解

     The singer, Mick Jagger, of the Rolling Stones sings a song  that tells people they can't

always get what they want but if we try sometimes we can get what we need. The past years in

my life my parents have told me this saying many times. I've always complained about the quote(引语). Although over time I have told myself to learn from it.

     This year my girlfriend flew off to college in West Palm, Florida. This has been a killer for me because I haven't been able to see her and she is having a rough time in school. The last two

months have been hard but we are working through it. I have been trying to get my dad to buy

me a plane ticket to go down there. My dad told me if I brought him some money he would help me pay for the ticket. I started to complain to him because I had no way of getting any money to give him. I spent several days and  nights thinking of ways to earn money to go to see my

girlfriend. I finally came to the conclusion that I would get a job and work hard to earn some

money to give to my dad. I applied to Safeway and I ended up getting the job.

     I have been working at Safeway for about a month now and work hard to earn money to go to see my girlfriend. The other day my mum had surprised me and told me that she asked her boss

if she could use their business miles(旅费) to buy me a ticket down to Florida for two weeks. I

was very thankful and told her I would help pay for anything that I have to. The thought of me

working hard and getting a job showed my mum that I really cared and was trying my best to be a successful person. I believe that you can't always get what you want but if you try sometimes,

you get what you need.

1. The author's parents often told him the saying quoted from the song because ________.

A. He liked to complain to them about his life

B. They expected him to earn from the singer

C. He always wanted to get everything he wanted

D. They tried to educate him to do things for himself

2. What does the word"killer"underlined in the second paragraph refer to?

A. Something that is quite troublesome.

B. Something that is very difficult.

C. A person who kills purposely.

D. A person who treats women very badly.

3. What can we infer from the passage?

A. The author was lazy and unwilling to work hard.

B. The author's father was too mean to give him money.

C. The author's actual action won support from his mother.

D. The author was unable to tear himself away his girlfriend.

4. By writing the passage, the author tries to show________.

A. we can do nothing without money

B. fathers are strict while monthers are kind

C. it's hard for parents to bring up their children

D. we should try to rely on ourselves for everything

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