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    Dinosaurs, one of the most successful groups of animals that have ever lived, evolved(进化) into many sizes and shapes. The word "dinosaur" was invented by Sir Richard Owen in 1842 to describe these "fearfully great reptiles(爬行动物) ".

    Some things to keep in mind about dinosaurs：

    ·Not everything big and dead is a dinosaur. Dinosaurs were a special group of reptiles. Although Pterosaurs(翼龙) were similar, they were not true dinosaurs.

    ·Not all dinosaurs lived at the same time. Different dinosaurs lived at different times. Although you can see Stegosaurus(剑龙) fought against Tyrannosaurus

(暴龙) in some movies like King Kong and Jurassic Park, no Stegosaurus ever saw a Tyrannosaurus. It's because Tyrannosaurus appeared on the Earth about 80 million years after Stegosaurus died out.

Being happy

    One thing is for sure that money cannot always make a person happy. What can make you happy?

    Some people seem to be born happy. Nothing seems to get them down. They can always see the best of every situation and they seem to smile their way through life. Some people seem to have everything going well but they still do not seem to be happy. No matter what kind of person you are, you can do something to build happiness into your life.

    Listening to music

    Music can be a great way to make you feel happy. You can listen to it, or even take up playing an instrument.

    Keeping pets

    You may not have a pet of your own, but pets are so good at making people happy. Pets help people feel happy by being lovely, needing to be looked after, and maybe needing exercise, which is good for you, too.

    Staying fit and healthy

    Try to keep fit and healthy by exercising every day. There are lots of things that you can do to keep your body feeling fit. The great thing about exercise is that it releases chemicals called serotonin(复合胺) into your brain and these chemicals make you feel happy！

    Being kind and smiling at others

    Often it is the small thing that makes people happy. Try to be kind and smile at people. You will help them to feel happy and will build happiness for yourself.