9[多选题] 关于组织培养，描述正确的有（） A.繁殖系数较低，切面较大，易感染病毒病等病害 B.主要用于大量生产无病毒商品花卉，尤其是观叶植物和鲜切花 C.繁殖速度快，繁殖系数大

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河南成教 / 河南理工大学

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9[多选题]
关于组织培养，描述正确的有（）

A.繁殖系数较低，切面较大，易感染病毒病等病害

B.主要用于大量生产无病毒商品花卉，尤其是观叶植物和鲜切花

C.繁殖速度快，繁殖系数大，繁殖方式多，适用的品种多

D.其寿命的长短除与遗传特性和发育是否健壮有关外，还受环境因素的影响

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河南理工大学

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1、The fact that blind people can see things using other parts of their bodies apart from their eyes may help us understand our feeling about color. If they sense color differences, then perhaps we, too, are affected by color without knowing it. Salesmen have discovered by experience over a long period of time that sugar sells badly in green wrappings(包装), that blue foods are considered not agreeable to the taste, and that cosmetics(化妆品) should never be packed in brown. Their discoveries have grown into a whole subject of color psychology(心理学). Some of our preferences(偏爱) for colors are clearly psychological. Dark blue is the color of the night sky and therefore connected with calm, while yellow is a day color connected with energy and encouragement. Experiments have shown that colors, partly because they are connected with psychology, also have a direct effect on people’s mind. People in bright red surroundings show an increase in breathing speed, heartbeat and blood pressure; red is exciting. Pure blue has exactly the opposite effect; it is a calming color. Being exciting, red was chosen as the signal for danger, but a close study shows that a bright yellow can produce a more basic state of alarm, so fire engines in some advanced areas are now rushing around in bright yellow colors that stop buses, trucks and cars. 1. The passage tells us that salesmen have _ _ _ _ _ _ _ _ _ _ . A. discovered the relationship between color and psychology B. tried out colors on blind people C. found out that color affect sales D. developed a special subject of color psychology 2. It can be inferred from the passage that _ _ _ _ _ _ _ _ . A. what color we prefer depends on our state of mind B. foods sell well in green or blue wrappings C. blind people cannot sense color difference D. a bright yellow has exactly the opposite effect to red 3. If people are exposed to(置身于) pure blue, _ _ _ _ _ _ _ _ _ . A. their blood pressure rises B. they want to taste blue foods C. they will feel like buying things D. they won’t easily feel nervous 4. The most effective color in the passage for warning people is _ _ _ _ _ _ _ . A. red B. dark blue C. bright yellow D. green 5. Which of the following do you think is the best title of the passage? A. Colors and sales B. Colors and feelings C. The blind and colors D. Preferences for colors英语（四）