问题 选择题

关于显微镜下列说法正确的是(  )

A.放大倍数越小,视野中细胞数目越少

B.粗准焦螺旋转动时,物镜移动范围小

C.镜头较脏时,可用干净的纱布擦拭

D.光线较弱时,反光镜使用凹面镜

答案

A、放大倍数越小,视野中细胞数目越多,故A错误;

B、粗准焦螺旋转动时,镜筒移动范围大,故B错误;

C、镜头较脏时,可用干净的擦镜纸擦拭,故C错误;

D、光线较弱时,反光镜使用能够汇聚光线的凹面镜,故D正确.

故选:D.

问答题 论述题
单项选择题

It seems that politicians around the world are thinking about the health of their countries. While in China, Chen Zhu has announced his plans for a universal health service and reform across health services. Gordon Brown, the UK Prime Minister, has also announced he is planning to make some changes in our health service.

The crux of Mr. Brown’ s proposals is related to giving the NHS ( National Health Service) a greater focus on prevention, rather than just curing patients.

He is planning to introduce increased screening for common diseases such as heart disease,strokes and cancer, for example, breast cancer. In Britain there are 200,000 deaths a year from heart attacks and strokes, many of which might have been avoided if the condition had been known about.

Initially, the diagnostic (诊断的) tests will be available for those who are vulnerable, or most likely to have the disease. One example is a plan to offer all men over 65 an ultrasound test to check for problems with the main artery (动脉), a condition which kills 3,000 men a year. The opposition have criticized Mr. Brown’ s proposals, saying that they are just a trick, and Claiming that there is no proper timetable for the changes. They also say that Mr. Brown is reducing the money available for the treatment of certain conditions while putting more money towards testing for them.

The NHS was founded in 1948, and is paid for by taxation. The idea is that the rich pay more towards the health service than the poor. However, in recent years there has been a great increase in the use of private health care, and it’ s much quicker. The NHS waiting lists for operations can be very long, so many people who can afford it choose to pay for medical care themselves.

All the following statements are true except that () .

 

A. all people should pay for their health care at the NHS

B. some people are against the reform of health care

C. the writer is likely to come from Britain

D. more money will be spent on testing people than before