单项选择题

______ modify the meaning of the stem, but usually do not change the part of speech of the original word.

A．Prefixes
B．Suffixes
C．Roots
D．Affixes
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单项选择题
The United States is ______ country in the world.
A．the most populous
B．the second most populous
C．the third most populous
D．the fourth most populous
单项选择题
The two newest states which joined the United States are ______.
A．Alaska and Kentucky.
B．Hawaii and Arizona.
C．Alaska and Hawaii.
D．Vermont and New Mexico.
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