1.B.bacteria ------复数
C.bacterium -----单数
这里要用复数形式,根据上下文
前面有some,所以后用单数,如果选C,前面要有a修饰
2.两个数词不可连用,故A.C排除,D之所以错是因为three （mile）,要么有a修饰,要么变复数,the是修饰good的.good 十足的,表修饰：可理解为相当怎么,加强语气用,没它也行.就是3英里
Some ___b___ cause serious diseases.
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