English Skills 10th Edition by John Langan, Zoe Albright

Exercise 19

This activity will sharpen your sense of the classifying process. In each of the ten groups, cross out the one item that has not been classifi ed on the same basis as the other three. Also, indicate in the space provided the single principle of classifi cation used for the remaining three items. Note the examples.
EXAMPLE
Mattresses
a. Double
b. Twin
c. Queen
d. Firm
Unifying principle:
_____________