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Most animals in the wild look after their b1.. For example, a mother bird fights with Enemies(敌人) to p2. her babies from danger. Before a mother bird has babies, it will s3.building a nest in a tree. A baby bird usually w4. about 30 grams at birth and you can hold it in your hands. Baby birds have f5. but they seem to have no bones. The mother bird will look after them for 15 years. If s6. come close to the nest, the mother bird will use its wings(翅膀) to cover the baby birds. Usually, the weak baby birds will d7.and only the strong ones can survive(幸存). Then they will start moving their wings and try to find out more about the world. Sometimes, you will find little birds on the ground. It is b8. their wings are not strong enough. They can only f9. for a short distance(距离) and then they fall onto the ground. Birds will begin to take care of themselves i10. they know how to fly.

九年级英语单词填空中等难度题

少年,再来一题如何?
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