为实现小区搜索，在下行方向传输的信号有（）。A.主同步信号 B.参考信号 C.辅同步

阅读理解。

     Liz Murray was only three years old when she realized her parents were hooked (吸毒成瘾的) on drugs.

In 1996, just before Christmas, Liz's mother died and her father moved to a homeless shelter (收容所). Her

mother's death inspired Liz to change her life. She decided go to high school, even though she was still

homeless.

     At the age of 15, Liz was beginning high school at a time most teenagers were graduating, but she

promised herself to become a "straight-A student". As she neared the end of her high school education,

and with her straight-A grades, Murray graduated in only two years. She was awarded (被授予) a New

York Times scholarship (奖学金) - $12,000 every year for four years for needy students and was accepted

into Harvard (哈佛) University in the fall in 2000.

     With the scholarship money coming her way, Liz started her studies. While she was there, she began

public speaking-helping people who, like herself, had an almost impossible mountain to climb to succeed in

life.

     She left Harvard in 2001 to care for her sick father and to start motivational (励志的) speaking, she

resumed (重新开始) her education at Columbia University to be closer to him. In late 2006, her father died

of AIDS. And then she returned to Harvard in 2006 and graduated in June 2009.

      Liz says she took some comfort in knowing that her father had died a sober (清醒的) man. "When

someone gets sober, it's almost like meeting them for the first time. Just before he passed away, he wrote

me this card. He wrote in the card, 'Liz, I left my dreams behind a long time ago. But I know now they're

safe with you. Now we're a family again."

1. Did Liz's parents take drugs? 

    _______________________________________________________

2. What made Liz change her life? 

    _______________________________________________________

3. How old was Liz Murray when she graduated from high school? 

    _______________________________________________________

4. Why did Liz Murray leave Harvard in 2001? 

    _______________________________________________________

5. What's the best title about the passage? 

   _______________________________________________________

小红坐在第3列第4行，可以用数对______来表示．

肾是排K⁺的主要器官，可引起低K⁺的情况有（）

A.Liddle综合征

B.尿路梗阻解除后利尿

C.肾小管性酸中毒

D.失钾性肾病

E.急性肾衰多尿期

患者男，63岁，上颌全牙列缺失，散在骨尖。下颌多数牙缺失，仅余，近中舌侧倾斜，牙槽嵴丰满，间距离正常

修复前应做的是（）

A．拔除

B．牙槽骨加高术

C．唇颊沟加深术

D．去除骨尖

E．以上都不是

下列哪个部位发生息肉，可按肿瘤分类（）.

A.膀胱

B.胃

C.结肠

D.十二指肠

E.肾