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When the nurse talked to mum she thought mum was a______.

A．nurse
B．visitor
C．patient
D．cleaner

单项选择题Which of the following words best describes mum

A．Polite.
B．Patient.
C．Changeable.
D．Clever.