一轴晶矿物斜交光轴切片的干涉图中，当视域内只有一个水平黑带时，顺时针旋转物台，黑带向

对肾上腺的影像学检查下列哪项不正确（）。

A.B超无创、无损、操作简便，可反复检查。一般可作筛选手段

B.CT能观察到正常人的肾上腺，检出0.5～1cm的病灶。具有安全、迅速、无创、分辨率高等特点，应作为肾上腺影像检查的首选

C.MRI应用造影剂或化学位移成像技术，不仅可对肾上腺肿块做形态学诊断，还可判断肿块性质

D.核素显像剂清晰度不如前三者，但其能在形态学的基础上提供功能信息。能判断功能亢进性病变的类型（增生或腺瘤）。全身显像对恶性嗜铬细胞瘤转移灶定位有独特优势

E.嗜铬细胞瘤在MR影像中T₁WI呈近似肌肉样信号，T₂WI呈明显低信号

If you want to stay young, sit down and have a good think. This is the research finding of a team of Japanese doctors, who say that most of our brains are not getting enough exercise and, as a result, we are growing old unnecessarily soon.

Professor Taiju Matsuzawa wanted to find out why quite healthy in northern Japan appeared to be losing their ability to think and reason at a rather early age, and how the speed of getting old could be slowed down.

With a team of researchers at Tokyo National University, he set about measuring brain volumes of a thousand people of different ages with different jobs. Computer technology helped the researchers to get most exact measurements of the volume of the front and side parts of the brain, which have something to do with intellect and feelings, and decide the human character. As we all know, the back part of the brain, which controls task like eating and breathing, does not contract with age.

Contraction of front and side parts—as cells die off—was seen in some people in their thirties, but it was still not found in some sixty and seventy-year-olds.

Matsuzawa concluded from his tests that there is a simple way to prevent the contraction—using the head.

The findings show that contraction of the brain begins sooner in people in the country than in the towns. “Those with least possibility,” says Matsuzawa, “are lawyers, followed by university professors and doctors. White collar workers doing the same work day after day in government offices are, however, as possible to have contracting brains as the farm worker, bus driver and shop assistant.”

小题1:The team of doctors wanted to find out _____.

A．at what point people grow mentally old

B．how to make people live longer

C．the size of certain people’s brains

D．which people are the most clever小题2:Their research findings are based on _____.

A．an examination of farmers in northern Japan

B．tests given on a thousand old people

C．examining the brain volumes of different people

D．using computer technology小题3:The doctors’ tests show that _____.

A．our brains contract as we grow older

B．one part of the brain does not contract

C．sixty-year-olds have better brains than thirty-year-olds

D．some people’s brains have contracted earlier than other people’s小题4:The most possible conclusion of the passage is that _____.

A．most of us take more exercise

B．it’s better to live in the town

C．the brain contracts if it is not used

D．the more one uses his brain, the sooner he becomes old

一般而言，在常年定期、定量交易的情况下，（）最合适

A.循环信用证

B.对背信用证

C.可转让信用证

D.对开信用证

简述意见沟通的障碍。

从一个种批中取出的全部初次样品，均匀地混合在一起叫（）。

A、初次样品

B、混合样品

C、送检样品

D、测定样品