15. What does the prefix im- mean?
A. against
B. down, without
C. not
D. absence, removal, separation
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14. What does the prefix ad- mean?
A. toward; near
B. away from
C. blue
D. through
13. “syndrome” means ___.
A. middle layer of the developing embryo
B. within the nose
C. group of symptoms occurring together
D. the last stage of cell division
12. “melanoma” means ___.
A. a newborn
B. through the skin
C. loss of color in the skin
D. dark tumor
二、Multiple ChoiceDirections： Choose the best answer from the four choices.11. Monoclonal refers to a colony (clone) derived from ___ cell(s).
A. three
B. two
C. half
D. one
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