单项选择题

— Oh, you made friends.
— No. We _________friends since we met in Beijing.

A．have made
B．have become
C．have been
D．have turned
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单项选择题
_________of the cactus take in water.
A．The leaves
B．The stems
C．The needles
D．The roots
单项选择题
The sharp, pointed needles of the cactus_________.
A．are their flowers
B．can take the place of their leaves
C．can protect itself
D．store water
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