The largest animal on Earth is the blue whale. It weighs (重量为......) about180tons - more than 24 elephants! It’s more than30 metres long. A newborn (新生的) baby blue whale weighs as much as a big elephant.

Cats can survive (幸存) falls from a very high place because they can turn themselves up the right way to keep their bodies safe. One cat fell 32 floors on to the street, but was just hurt a little.

Usually wolves do not attack (攻击) people. Wolves do not usually go together, but they may do this in winter. Why do wolves howl (嚎叫 ) at the Moon? In fact, wolves don’t howl at the Moon. And wolves do not always sit when they howl - they often stand.

Animals are our best friends. They are important to us. They________ together with us on the Earth. We cannot live without animals. So we should take good care of them. Then how can we protect   animals?

First we should _______ the importance of protecting wild (野生的) animals. Animals are an important source (来源) of food. Every animal has its place in the balance (平衡) of _______. If we destroy (破坏) a kind of animal, we will have many other _______ very soon. For example, when farmers _______   a large number of hawks (鹰), the mice will destroy farmers rice. Why? Because hawks eat _______. Without hawks. the mice will become _______.

Second, let people know how to protect animals - _______ killing wild animals and protect their_________. If we see other people destroy animals homes, we should stop them.

________ wild animals is the duty of each of us. Let s protect animals together！

In the universe, there is the Sun. The Moon, the Earth and so on. We know the Earth goes around the Sun, and the Moon goes around the Earth. We have day and night because the

Earth keeps turning all the time. When our part of the Earth turns to the Sun, it is day, When our part of the Earth turns away from the Sun, it is night.

Just because the Moon is closer to the Earth than the Sun, it looks much bigger than the Sun. Big things will look smaller when they are further, and small ones look bigger when they are nearer.

The Sun is big enough to give out very strong light. The Moon can't give out any light, but it looks quite bright too. Why? In fact, the light from the Moon comes from the Sun. The Moon looks much bigger and brighter than the stars. But actually (事实上) the stars are much bigger and brighter than the Moon. Also, they look smaller than the Moon because they are further away from the Earth。

There are many other planets (行星) in the universe. But of all the planets, people can only live on the Earth.