题目

No one understood cholera and every time it came, thousands died. Neither its cause 61.______ its cure was understood. Queen Victoria's doctor, John Snow, wanted to find 62.______ how it was caused. When the disease came to London again in 1854, Snow noticed that most of the 500 people 63.______ died had drunk water from a water pump in Broad Street. Two other deaths were linked to the Broad Street outbreak. A woman and her daughter used the water from Broad Street pump and died. With the 64.________(support) evidence, he was able to announce 65._______ certainty that the water carried用徒手切片法切取叶片薄片制成临时装片，观察到如图所示的结构．请回答：①[2]是 ，判断的依据是 ；[6]是 ，判断的依据是 ．它们都属于 组织．②[3] 和[5] 共同构成了 ，属于 组织．③[ ] 内含有输导水分、无机盐的 和输导有机物的 ．