Thursday Morning Riddle

I’m your usual preference to ask for a date;
I’m to cast in a role only based on one trait;
I can classify blood that you need or donate;
And you count words per minute to measure my rate.

Who am I?

UPDATE: Riddle solved by Alex. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. Alex Says:

    Type

  2. Bill Says:

    TYPE is correct. Way to go, Alex!

    Sorry for the delay, but the website has been down. More to come…

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