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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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
Why did her friends and neighbours stop seeing her after a few months
A．Because they had to travel a long way to see her.
B．Because they had found some new friends.
C．Because they had fallen sick.
D．Because they had lost interest in the new place.
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