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【单选题】

David Fajgenbaum remembers the exact date: July 17, 2003. It was a warm evening in Washington, D.C., and the 18-year-old freshman had just finished his first football practice at Georgetown University. "It was awesome," the former quarter back recalls. He called his parents to let them know how well things were going. David"s dad, an orthopedic (整形手术的) surgeon, was oddly subdued. Finally, in a soft voice, he said, "Son, your mom has brain cancer."
"I went from being happier than I"d ever been to total shock," says David. Rushing home, he announced he was dropping out of college to support his mother through her illness. But Anna Marie Fajgenbaum, just 52 years old and diagnosed with stage 4 brain cancer, was insistent that her son return to Georgetown.
David threw himself into his studies and grew increasingly isolated. "I felt I was the only person on campus with a sick parent. When everyone"s sitting around laughing and talking, you don"t bring up your mother"s latest MRI (磁共振) or say you"ve been crying."
One October evening when David was home visiting, Anna Marie woke up weeping. She was worried about David and his two sisters. "Mom, I"m going to be okay," David assured her. Then, out of the blue, he said, "And I"m going to help other kids cope with loss." A smile spread across his mother"s face. He decided on a support group called Ailing Mothers and Fathers—based on his mom"s initials, AMF.
When Anna Marie died later that month, David started hearing from friends who"d never even known his morn was sick. Some had gone through the same experience. "The mother of one of my best friends had also died of a brain tumor," says David. "How did we not know that Because we didn"t talk about it."
He invited five students who"d lost relatives or friends to his D.C. apartment to talk. They decided to meet every other week, to share what they were going through and how they were coping. But they did more than talk. They also raised money: They participated in the Iron man 10K for cancer research, walked to battle ALS, and ran to defeat lung cancer.
David learned that nearly half of college students had lost a loved one within the previous two years. And every one of them has a story to tell. Julie George, who heads the Georgetown chapter, found out her dad had ALS during her freshman year.
"I went to my first AMF meeting and felt like a huge weight had been lifted. It gave me a place to talk about the concerns for my family, the things that don"t come up over pizza in the common room or by a keg in someone"s backyard."
David graduated from Georgetown last year and is studying public health at the University of Oxford. Now 23, he plans to become an oncologist (肿瘤学家) and will attend medical school at the University of Pennsylvania in the fall.
The National Students of Ailing Mothers and Fathers Support Network has 2,000 participants on 23 campuses. "This organization," says David, "is about one thing: being there for one another. And every time I see those initials—AMF—I see my morn, and I know I am honoring her by helping others. She would have liked that." After knowing that his mother had been diagnosed with brain cancer, David ______.

A.
was forced to drop out of school
B.
was distracted from his studies
C.
felt detached from his fellow students
D.
tried to hide it from his classmates
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举一反三

【单选题】比较适合于干性强的树种的整形方式( )

A.
丛球形
B.
自然开心形
C.
中央领导干形
D.
多领导枝形

【多选题】下列哪些可以作为肿瘤学基础研究的对象/模型?()

A.
人群
B.
肿瘤病人
C.
肿瘤细胞
D.
裸鼠肿瘤移植瘤模型
E.
以上都是

【多选题】偶合常数反应的是核磁共振谱线自旋-自旋分裂的特点,具体的有( )。

A.
各谱线分量之间的距离相等
B.
谱线分量的间距与外磁场强度无关
C.
谱线各分量的强度是对称分布的,并与多项式 (a+b)n 的系数成正比
D.
如果对它发生作用的原子核(I=1/2)数目为n,那么谱线就分裂为(n+1)条多重线

【单选题】可用于磁共振引导下活检的是()

A.
低场开放式磁共振
B.
高场磁共振
C.
低场专用型磁共振
D.
超导型磁共振
E.
常导型磁共振

【单选题】核磁共振的弛豫过程是()

A.
自旋核加热过程
B.
自旋核由低能态向高能态的跃迁过程
C.
自旋核由高能态返回低能态,多余能量以电磁辐射形式发射出去
D.
高能态自旋核将多余能量以无辐射途径释放而返回低能态

【单选题】与CT等影像学方法比较,磁共振在肝脏病变的影像学检查中,具有的优势不包括( )

A.
价格便宜
B.
无放射性,有利于多次或者长期复查患者的检查
C.
软组织分辨率高,有助于小病灶的检出
D.
常不需对比剂对病变进行定性诊断
E.
多种功能参数可供选择,协助病变诊断