下面的安全攻击中不属于主动攻击的是_______。A．假冒 B．拒绝服务 C．重放

男性，56岁，上颌牙列缺失，下颌剩余右侧45，和左侧234。其中右侧4松动Ⅱ度，近中倾斜并向对颌伸长，牙槽骨吸收至根中1／3；右侧5松动Ⅰ度；左侧2、3为残根。叩（-），X线片示剩余根长10～15mm，未行RCT，根尖区无阴影；左侧4松Ⅱ度，近中倾斜，向对颌伸长，牙槽骨吸收至根中1／3。

患者戴用覆盖义齿6个月后复诊，发现余留牙无龋坏、牙龈炎，但左侧3周围牙槽骨快速吸收，最可能的原因是（）

A.患者严重缺钙

B.患者内分比失调，激素水平改变，导致骨质疏松

C.左侧3与义齿基托的缓冲间隙不足

D.患者没能控制好左侧3的牙周病

E.患者有左侧咀嚼习惯

In December of l 992．I was a happy husband and father of two young children．A month later，I was diagnosed with Acute Lymphoblastic Leukemia(急性白血病)．

After two years of chemo(化疗)that helped control the disease，my body was weak and lifeless．I felt as if I were a puppet who needed help to lift his arms or hold up his head．

I began to run．After six months my strength had come back．On one of my runs，one where I felt I could run forever，I decided I was going to try to run a marathon．

After telling my Dad about my plan，he told me of a program that trains people to run a marathon，while raising funds for Leukemia research at the same time．So that summer，through the Leukemia Society’s Team in Training program，I started to train for the Marine Corps Marathon．During mile after mile of uncertainty，the day finally came to run the marathon．

On October 27，1996，at 8 A．M．，along with l9,000 other brave souls I started on a 26.2-mile journey that I will never forget．

I first saw my wife Patty at the six-mile mark . She seemed happy that I was still looking as if I knew what I was doing，and having a good time doing it．At Mile l7，my mind was going back to those two horrible years that tried to bring my family and me down．I saw her again．The concern in her face told me she knew I was starting to struggle．I felt as if we were thinking the same，nine more miles and these last few years will be behind us．

That thought alone pulled me forward．Mile 22，23，slowing but going，24，25，then there it was．The Iwo Jima War Memorial．I have seen nothing so grand and inspiring in my life．Three hours and forty-one minutes after I started，I crossed what I think has to be the most fitting finish line in all of road racing!

That night the Leukemia Society gave me a pin at a post-race party that simply says，“Leukemia 26.2”．

If God wills，my cancer may once again take away my hair and my strength，maybe even my life．But it can never take away my pin，or the fact that I am a marathoner .

小题1:The writer decided to run a marathon because __________ .

A．he wanted to raise money for Leukemia research

B．he believed he was able to take the challenge

C．he hoped to recover his strength through training

D．his dad knew about the race and made the suggestion小题2:Which statement is RIGHT about the writer?

A．He has always been dreaming of becoming a marathoner．

B．The training he took that summer well prepared him for the race．

C．Those running in the race were mostly Leukemia patients like him .

D．His wife was with him during the marathon to give him support．小题3:Why does the writer think the finish line is the most fitting?

A．Because running a marathon is the most suitable sport for him．

B．Because the memorial is the most powerful construction he has seen．

C．Because he considers it a victory over his disease to finish the race．

D．Because 26.2 miles is the most reasonable distance for road racing．小题4:Which of the following can best describe the writer?

A．Optimistic and outspoken

B．Strong-willed and determined

C．Generous and easy-going

D．Brave and warm-hearted

Li Ming didn't know anything about it _______ I told him. 　　[ ]

A. after　　　　　　

B. until　　　　　　

C. if　　　　　　　

D. because

材料的软化系数

下列是粟粒性肺结核在X线胸片的特征的是（）

A.两肺尖部一般不受累

B.从肺尖到肺底大小均匀的结节影

C.胸膜增厚

D.胸腔积液

E.肺门淋巴结增大