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The case has already been made for endangered languages as a subject worth linguistic attention in recent works such as Crystal ( 2000 ) and Nettle and Romaine ( 2000 ) , as well as the seminal Krauss ( 1992 ) . People tend to categorize snakes as either venomous or harmless , but , as colubrids demonstrate , the reality is a continuum , from completely harmless , to mildly venomous , to deadly . A grade column can be defined as the simple sum of a student 's highest grades taken from a set of assignments . If we taxied all the way to the end of the runway , " said Tailspin Tommy , " by the time we reached the other end , this flight would qualify as a cross country .