【猜想与假设】甲认为：铜片表面的黑色固体是烟灰．

乙认为：铜片表面的黑色固体可能是空气中的氧气与铜反应生成的新物质．

丙认为：铜片表面的黑色固体既有烟灰又有氧气与铜反应生成的新物质．

【查阅资料】①酒精不充分燃烧产生炭黑（即黑烟）；

②氧气的化学性质比较活泼，加热条件下能与金属铜反应生成黑色的氧化铜．

每年4﹣7月是我区手足口病高发季节，手足口病是由多种肠道病毒引起的传染病，最常见的是柯萨奇病毒A16型及肠道病毒71型，多发生于5岁以下儿童，表现口痛、厌食、低热、手、足、口腔等部位出现小疱疹或小溃疡，严重时甚至死亡．据悉，截至4月11日，广西已累计报告手足口病病例17345例，死亡27例．目前尚无疫苗．托幼单位每日进行晨检，发现可疑患儿时，采取及时送诊、居家休息的措施；对患儿所用的物品要立即进行消毒处理；有些幼儿园放假十天，并发放了《致家长的一封信》和宣传资料进行解释．

（1）肠道病毒是手足口病的____ ．

（2）从传染病的环节来看，患儿所用的物品属于____ ．

从预防传染病的措施看，幼儿园放假十天，属于____ ．

（3）若手足口病疫苗研发成功，注射的疫苗从免疫学角度分析属于____ ，这种免疫类型是____ 

    A taboo (禁忌) is a social action that is not allowed. Every culture in the world has____(it) own taboos. The breaking of a taboo sometimes makes people feel____(comfort). I learned this through my own experience.

    Last weekend, Wang Lin and I showed two____(foreign) around our city. Mr. Singh was from India and Mr. White from the USA. When I____(hold) out my left hand to shake hands with Mr. Singh, he seemed to be unhappy. Mr. White,____, was quite casual. He said hello to me with a big smile and a wave of his hand.

    In the evening, we stopped at a restaurant for dinner. I noticed that Mr. Singh didn't touch the beef and Mr. White seemed not____(like) chickens' claws. During the meal, Wang Lin said sorry to Mr. Singh and continued____(explain) that we didn't know it was a taboo in India to shake one's left hand. Mr. Singh explained that____oxen are sacred (神圣的) in India, people don't eat beef there. Mr. White joined in and said that____was not usual in the USA for people to eat chickens' claws. He went on to say that ____(America) don't usually get into each other's personal space. Isn't it a good lesson that needs remembering?

细胞的全能性是指( )