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文件名最多由（ ）个字符组成，不能有哪些符号出现，如（ ）、（ ）、（ ）、（ ）等
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Rays of hope in rising rudenessRude deeds are becoming increasingly common. Faced with rudeness in public, most people 1) _______ it, or mind their own business, or get out of the way. It is generally 2) _________ around the world that the inhabitants of large cities are ruder than their fellow citizens from smaller towns or the countryside. What are the reasons behind it? Some experts say that the trend began decades ago when people became resistant to 3) __________ values and manners.Some people blame 4) ___________ modern lifestyles for contributing to a society that has little time to be polite. Others find that stress also plays a role in incident of 5) _________ behavior and is becoming strikingly common. Rudeness has many forms. Beside verbal 6) ____________, people tend to be violent. There is disagreement as to whether the situation is improving or not. Many see little hope for a 7) _________ in today’s rude behavior. Others are feeling more hopeful.Nowadays, more people are 8) ___________ their time for community projects; also, donations of goods and money to charities have increased. These acts of kindness would have a 9) _______ effect on others and would help to reduce the stress in society. Let’s hope this optimistic view 10) _______ and brings a better, brighter world for us all.
炼苗的环境开始时和( )相似,后期类似于田间栽培条件。
试管苗的生长环境与自然环境的区别为( )。
试管苗的结构特点( )。
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