阅读理解，判断正误。

Boys and girls, do you know what the largest animals in. the world is? You must think it is the elephant.

In fact, the world's largest animal lives in the sea. It is the blue whale. It can be over 30 metres long. A blue whale can weigh more than 150 tons that is heavier than30 elephants.

You may think the blue whale must eat great big fish, but in fact it eats only tiny (微小的) creatures(生物) like shrimps(虾).

People often kill the blue whales for their meat and oil. Now nobody is allowed to(允许) kill the blue whales.