单项选择题

Some birds like to sit on a sheep because ______.

A．they can eat its parasites
B．they enjoy travelling with the sheep
C．they depend on the sheep for existence
D．they find the position most comfortable

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热门试题

单项选择题

We learn from the text that corals depend on plants for______.

A．comfort
B．light
C．food
D．oxygen

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