单项选择题

Are your shoes new

A．No, it's old.
B．No, they are old.
C．Yes, it's old.
D．Yes, they are ol
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单项选择题
______ of the children were late for school.
A．No
B．Not
C．None
D．Any
单项选择题
Scientists are always studying the ______ of nature.
A．phenomenons
B．phenomenon
C．phenomenas
D．phenomena
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