填空题
Where do fish live?
They live ______ where there is water.
填空题
How many kinds of fish are there in the world?
______.
填空题
How long does the biggest fish grow up to?
______.
填空题
What is the characteristic of a sea horse?
It doesn't ______.
填空题
What does a sea horse do when it wants to stay in one place?
It takes hold of plants with ______.