单项选择题

A．onto
B．on
C．at
D．for
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单项选择题
A．forwardB．up toC．towardD．up and down
A．forward
B．up to
C．toward
D．up and down
单项选择题
Why are female butterflies safe from enemies
A．Because they are bigger.
B．Because they are heavier.
C．Because they cannot be seen with their wings closed.
D．Because they have colors that are not so bright.
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