单项选择题

What does the second paragraph mainly discuss

A．Some animals and plants depend on each other for existence.
B．Some animals and plants develop their relationship easily.
C．Some plants depend on each other for food.
D．Some animals live better together.
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单项选择题
When she took a mop from the small room what Mum really wanted to do was ______.
A．to clean the floor
B．to please the nurse
C．to see a patient
D．to surprise the story-teller
单项选择题
A．problemB．positionC．foodD．ceiling
A．problem
B．position
C．food
D．ceiling
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