Have Your Heart in Your Mouth.

This expression means that you're really afraid or anxious about something. When your heart starts beating so much that you can feel a thumping(怦怦跳) in your throat, it may feel like you "have your heart in your mouth."
Have Butterflies in the Stomach
How did butterflies get in your stomach? Well, those really aren't butterflies in there. It is a way of describing those nervous feelings you might get before a test or a very important decision.These stomach flutters (跳动) are normal and happen to many people. Some people believe having a few butterflies might even help you perform better.
Sick as a Dog
If you've ever been very sick, you may have used this expression. Because dogs eat just about anything they find, they often get sick. So it's all right to describe someone who's not feeling well as being "sick as a dog".
Under the Weather
When it's rainy all day outside, how would you feel? This expression comes from the idea that bad weather might hurt a person's health and mood(心情).

    There are some easy things you can do to protect(保护) the environment and the earth. Choose ideas from the list or come up with a few of your own.

    ●Plant flowers grass or trees.

●Whenever you visit a park or beach, take away what you bring there—-keep rubbish in a bag until you can put it in a dustbin.

    ●Turn off the lights, TV sets when you leave the room. This saves a lot of electricity.

    ●Turn off the tap when you brush your teeth. You can save some water by not letting it run. Also, use a glass cup instead of a paper cup because this saves paper.

    ●Keep the doors and windows closed in winter to keep warm air in.

    ●Give your old books and magazines to a library instead of throwing them away.

    ●Give your old clothes to poor children you know instead of throwing them away.

    ●Use both sides of paper.

    ●Stop pouring dirty water into the rivers or the lakes nearby.

    ●Encourage all your friends to do the same things you do to help protect the earth.

    You don't have to wait until Earth Day to do these things. Make every day Earth Day.

    If everyone makes a contribution (贡献)to protecting the environment, the world will become much more beautiful.

    Computer technology has become a major part of people's lives. This technology has its own special words. One example is the word " mouse". A computer mouse is not a small animal that lives in buildings and open fields. It is a small device (装置) that you move around on a flat surface in front of a computer.The mouse moves the cursor (光标) on the computer screen.

    Computer expert Douglas Engelbart developed the idea for the mouse in the early nineteen-sixties. The first computer mouse was a carved block of wood with two metal wheels. It was called a mouse because it had a tail at one end. The tail was the wire that connected it to the computer.

    Using a computer takes some training. People who are experts are sometimes called hackers. A hacker is usually a person who writes software programs in a special computer language. But the word" hacker" is also used to describe a person who tries to steal information from computer systems.

    Another well known computer word is Google. It is the name of a popular search engine for the Internet.People use the search engine to find information about almost any subject on the Internet. The people whostarted the company named it Google because in mathematics, googol, spelled g-o-o-g-o-l,is an extremely

    large number. It is the number one followed by one hundred zeros.

    When you "Google" a subject, you can get a large amount of information about it. Some people like to Google their friends or themselves to see how many times their name appears on the Internet. If you Google someone, you might find that persons name on a blog. A blog is the shortened name for a Web log. A blog is a personal Web page. It may contain stories, comments, pictures and links to other websites. Some people add information to their blogs every day. People who have blogs are called bloggers.

The story of Zu Chongzhi

Zu Chongzhi （429 — 500 AD） was a Chinese mathematician ，astronomer and mechanic .He was {#blank#}1{#/blank#}（birth） in a well — educated family . {#blank#}2{#/blank#} an excellent engineer，Zu Chongzhi's grandfather taught him science.From {#blank#}3{#/blank#}early age，Zu Chongzhi showed great {#blank#}4{#/blank#}（intelligent） and curiosity，with special interests in mathematics and astronomy.Today we know Zu Chongzhi {#blank#}5{#/blank#}he was the first person to find out that pi （π） falls between 3.1415926 and 3.1415927，and {#blank#}6{#/blank#}（he） result remained the {#blank#}7{#/blank#} （many） accurate value in the world for more than nine hundred {#blank#}8{#/blank#}（year）.Zu Chongzhi also {#blank#}9{#/blank#} （ work ） out the close value of pi to be 355/113，which he called "close ratio".This ratio was so hard {#blank#}10{#/blank#}（get） that a Japanese mathematician named it "Z's ratio".

 In China, the 12th month of the lunar calendar(阴历) is called Layue. The month is full of interesting festivals and customs.

 Laba Festival, which is on the 8th day of Layue, is the first festival in this month. From this day on, people begin to get ready for the Chinese New Year.

 On Laba Festival, people often eat hot Laba porridge (腊八粥). There are usually eight things in the porridge: rice, red beans, peas, dried lotus seeds, dates, and three different kinds of fruits and nuts. The porridge is not just good for your health, but a blessing for the coming of the Chinese New Year.

 Laba porridge is not the only tasty food in Layue. Laba garlic(腊八蒜) is popular in the north. People begin to put the garlic in vinegar(醋) from that day on, and eat it with dumplings during the Chinese New Year. While in the south, people like making sausages.

 Another celebration before the Spring Festival is Xiaonian. It is usually on the 23rd or 24th day of the last lunar month. Xiaonian is an important day when people offer sacrifices(提供祭品) to the Kitchen God(灶神) who looks after the family.

 Don't forget to clean your home. This is also an important thing to do to prepare for the Chinese New Year. It means sweeping away the dust of the old year and welcoming a fresh start. Now, the last thing for you to do is to wait for the coming Spring Festival.