Which type of abbreviation does the word ER belong to?
A. initialism
B. acronym
C. clipping
D. blending
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Which type of abbreviation does the word COVID-19 belong to?
A. initialism
B. acronym
C. blending
D. clipping
Which type of abbreviation does the word SARS belong to?
A. initialism
B. acronym
C. clipping
D. blending
Which type of abbreviation does the word flu belong to?
A. initialism
B. clipping
C. acronym
D. blending
What is the combining vowel in the word "osteoblast"?
A. e
B. o
C. a
D. l