在土壤中粒径>（）mm的土粒叫物理性沙粒 A.1mm B.0.5mm C.0.1mm

肺实质在MRI平扫成像不理想，原因有（）

A.呼吸运动产生运动伪影

B.水气交界面微磁场不均匀

C.肺内氢质子含量少，信号微弱

D.心跳产生运动伪影

E.肺部血流妨碍射频脉冲再次激励

阅读理解。

     I woke up one morning last week to read a story about an athlete who had seemed to have

everything.

     US track star Marion Jones owned a trophy (奖杯) case filled with medals. She had worldwide

fame. She held the high honor of being the first female track and field athlete to win five medals at an

Olympics- the 2000 Sydney Games.

     But last Friday, the 31-year-old track star tearfully confessed that she had lied to fans, sports

official and US federal agents about taking steroids.

The five Olympic medals in her trophy case? Gone. Meaningless. The worldwide fame? Exchanged

for infamy. The honor of being the first female track and field athlete to win five medals at an

Olympics? Forgotten, wiped off the record books.

     "It is with a great amount of shame that I stand before you and tell you that I have betrayed your

trust." Jones confessed.

     She'd posed for pictures with fans. She'd attended parties and talked about her accomplishments.

But for years she'd slept - or tried to sleep - knowing that much of what she had done was built on a lie.

     Now, finally, she'd decided to tell the truth.

     "If she had trusted her own natural gifts and allied them to self-sacrifice and hard work, I sincerely

believe that she could have been an honest champion at the Sydney Games." IAAF President Lamine

Diack said over the weekend. "Instead, Mario Jones will be remembered as one of the biggest frauds

in sporting history."

     Sadly, she won't be the last. There are still others lurking(潜伏) behind their trophies. They too

appear to have everything. They're superstars, the envy of every young person who has played a

 sport. But for how long? And at what cost? Every time they look at their trophies and medals they

remember that the awards really belong to someone else.

1. The main character in this passage is__________.

A. the writer himself

B. Marion Jones

C. IAAF president

D. US federal agents

2. It is still a worry that __________.

A. Marion Jones has cheated the public so long

B. Marion Jones may be remembered as a fraud in sporting history

C. IAAF president will not forgive Marion Jones

D. cheating is still widely existing in sports competition

3. The writer values __________ most in this passage.

A. Marion Jones' deciding to tell the truth

B. the honesty and hard work in sports competition

C. trophies, medals and champions

D. the spirit of Olympic Games          

锗（Ge）是第ⅣA族元素，它的单质是一种良好的半导体材料，被广泛地应用在电子工业上，锗可以从烟道灰中提取，其过程如下：

（1）写出上述各步反应的化学方程式①______；②______；③______；④______．

（2）提取过程中①至③的作用是什么？从节约资源角度考虑哪一步的产物可以循环使用？

患儿，男，8岁，眼睑浮肿4天伴尿少，近2日尿呈浓茶色，患儿无尿频、尿急、尿痛。患儿3周前曾患上呼吸道感染。查体：体温36.2℃，呼吸26次/分，脉搏100次/分，血压 130/90mmHg，神清，双眼睑及颜面水肿，双足背轻度非凹陷性水肿，心肺(-)，腹软，肝脾肋下未及。

该患儿正确的诊断是( )。

A．先天性肾病

B．单纯性肾病

C．肾炎性肾病

D．急性肾小球肾炎

E．泌尿系统感染

横位腹部检查下列哪项是错误的？（）

A.子宫轮廓呈横椭圆形

B.胎体纵轴与母体纵轴交叉呈锐角

C.母体腹部一侧可触及胎头

D.耻骨联合上方较空虚

E.胎心在脐旁可清楚闻及