单项选择题

Which of the following nouns share the same form of its singular and plural form

A．appendix
B．stadium
C．deer
D．hypothesis
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单项选择题
Which of the following is not a compound word (复合词)
A．greenhouse
B．clearway
C．rainbow
D．interaction
单项选择题
Which of the following word includes a suffix (后缀)
A．friend
B．telephone
C．physician
D．dislike
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