单项选择题

Wild ducks always fly in a definite _______.

A．figure
B．formula
C．shape
D．formation
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单项选择题
The idea of traveling through _______ space to other planets interests many people today.
A．a.
B．the
C．\
D．one
单项选择题
Samuel has curly hair but his twin sister's is quite ______.
A．even
B．straight
C．uneven
D．regular
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