单项选择题

Some birds like to sit on a sheep because ______.

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

<上一题目录下一题>

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

The underlined word they in the last sentence of the first paragraph refers to ______.

A．birds and parasites
B．birds and sheep
C．parasites and sheep
D．sheep, birds and parasites

相关试题