腭裂手术时在腭部黏骨膜下注射含肾上腺素的麻醉药或生理盐水的主要目的是
A. 减少疼痛
B. 减少出血、便于剥离
C. 减少肿胀
D. 防止血管损伤
E. 以上都不是
Generations of Americans have been brought up to believe that a good breakfast is one of life’ s essentials. Eating breakfast at the start of the day, we have all been told, is as necessary as putting gasoline in the family car before starting a trip. But for many people the thought that food is the first thing you have, in the morning is by no means a pleasure. So despite all the efforts, they still take no breakfast. Between 1977 and 1983, the latest years for which figures are available, the number of people who didn’ t have breakfast increased by 33 percent—from 8.8 million to 11.7 million—according to the Chicago-based Market Research Corporation of America. For those who feel pain or guilt (内疚) about not eating breakfast, however, there is some good news. Several studies in the last few years indicate that, for adults especially, there may be nothing wrong with omitting breakfast. "Going without breakfast does not affect performance." said Arnold E. Bender, former professor of nutrition (营养) at Queen Elizabeth College in London, "nor does giving people breakfast improve performance." Scientific evidence linking breakfast to better health or better performance is surprisingly inadequate, and most of the recent work involves children, not adults. "The literature," says one researcher, Dr. Ernesto Pollitt at the University of Texas, "is poor.\ In the third paragraph, "nor does giving people breakfast improve performance" means ______.
A. anyone without breakfast does improve his performance
B. not giving people breakfast improves performance
C. people having breakfast do improve their performance
D. having breakfast does not improve performance
People associate colours with different things and feelings. Red, for example, is the colour of fire, heat, blood and life. People say red is an exciting and active colour. They associate red with a strong feeling like anger. Red is also used for signs of danger, such as stop signs and fire engines. Orange is the bright, warm colour of leaves in autumn. People say orange is a lively co]our. They associate orange with happiness. Yellow is the colour of sunlight. People say it is cheerful colour. They associate yellow, too, with happiness. Green is the coot colour of grass in spring. People say it is a refreshing eolour. In general, people talk about two groups of colours: warm and cool colours. The warm eolours are red, orange and yellow. Where there are warm colours and a lot of light, people usually want to be active. Those who like to be with others like red. The cool colours are green and blue. Where there are these colours, people are usually quiet. Some scientists say that time seems to go by more slowly in a room with warm colours. They suggest that a warm colour is a good one for a living mom or a restaurant. People who are having a rest or eating do not want time to pass quickly. Cool colours are better for some offices where the people working there want time to pass quickly. Cool colours are liked by the people working in the offices because they ______.
A. want time to go by slowly
B. are scientists and enjoy the colours
C. often have a rest during the working hours
D. want to pass time quickly
They am (excite) ______ to know that we won the match.