living!These stories are very interesting to read.

题目

living!These stories are very interesting to read.
There are lots of stories about animals living long lives.Some say snakes can live hundreds of years.Some say birds can sleep for years.After they wake up,they are But do you think they are true?No!Most animals don't live as long as people do .Of course,it's hard to know an animal's age.Because animals can't say,“I'm …years old.” But here are some animals.An elephant is very old at 60.A horse is old at 50.Bears live to be about 35.Monkeys live to be 25.The oldest birds are parrots and eagles.They live to be about 50.There's one animal that lives longer than people.That's the tortoise.One tortoise is said to have lived to be 200 years,because it doesn't like to move（移动）.

答案

因为只有 it 才能做形式宾语,而 that或this都不能.你只要记住这个句型就to read English stories.that不能这样用,但可以指代从句.