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
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.
单项选择题
Mrs. Green was moved out of her old house mainly because
A．her son was going to work in America
B．she didn't want to do housework any more
C．her house was to be replaced by a new building
D．her friends had all moved away from the area
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