| A．Chicken. | B．Tea. | C．Soup. |
| A．The man. | B．Lucy. | C．The woman. |
| A．Trying on dresses. | B．Paying for a dress. | C．Returning a dress. |
| A．He is a poor dancer. | B．He doesn’t like dancing. | C．He accepts the invitation. |
5 . Satellites are an important part of our ordinary lives. For example, the information for weather forecasts is sent by satellite. Some satellites have cameras which take photographs of Earth to show how clouds are moving. Satellites are also used to connect our phone calls.
Computer connections of the World Wide Web and the Internet also use satellites. Many of our TV programs come to us by satellite. Airplane pilots sometimes also use a satellite to help them find their exact location.
We use satellites to send television pictures from one part of the world to another. They are usually 35,880 kilometers above the equator (赤道). Sometimes we can see a satellite in the sky and it seems to stay in the same place. This is because it is moving around the world at 11,000 kilometers an hour — exactly the same speed that the Earth rotates (转动). A satellite must move around the Earth with its antennae (天线) facing the Earth. Sometimes, it moves away from its orbit (轨道), so there are some rockets on it which are used to put the satellite back in the right position. This usually happens about every five or six days.
Space is not empty! Every week, more and more satellites are sent into space to orbit Earth. A satellite usually works for about 10-12 years. Satellites which are broken are sometimes repaired by astronauts or sometimes brought back to Earth to be repaired. Often, very old or broken satellites are left in space to orbit Earth for a very long time. This is very serious because some satellites use nuclear power and they can crash into each other.
1. Which of the following is NOT done by satellite according to the passage?| A．Sending information for weather forecasts. |
| B．Taking photographs of the Earth. |
| C．Sending TV pictures to the Earth. |
| D．Providing food for airplane pilots. |
| A．35,880 kilometers per hour. |
| B．335,880 kilometers per hour. |
| C．11,000 kilometers per hour. |
| D．110,000 kilometers per hour. |
| A．A satellite moves around the Earth forever. |
| B．A rocket always keeps a satellite’s company. |
| C．A satellite seems to stay in the same place in the sky. |
| D．The satellite puts the rockets in the right position. |
| A．A satellite usually works for about 10-12 years. |
| B．Every time a satellite gets broken, it is thrown away. |
| C．A broken satellite is never left in space. |
| D．Broken satellites always crash into each other. |
| A．Pay the bill. | B．Wear a sweater. | C．Turn on the heater. |
7 . Blowing Up Balloons with CO₂
Chemical reactions (化学反应) make for some great experiments. You can make use of the CO₂(carbon dioxide) given off by a baking soda (小苏打) and lemon juice reaction to blow up your balloon!
What you’ll need:
●Balloon ●About 40ml of water ●Soft drink bottle
●Juice from a lemon ●I teaspoon of baking soda
Instructions:
●Before you begin, make sure that you pull the balloon long to make it as easy as possible to blow up.
●Put the 40ml of water into the soft drink bottle.
●Add the baking soda and mix it with water.
●Put the lemon juice in and quickly put the balloon over the mouth of the bottle.
What’s happening?
If all goes well, then your balloon should inflate! Adding the lemon juice to the baking soda creates a chemical reaction and produces CO₂. The gas rises up and escapes (逸出) through the soft drink bottle. It doesn’t, however, escape the balloon, pushing it outwards and blowing it up.
1. Which of the following do you need for the experiment?| A．Two cups. | B．Apple juice. |
| C．250 ml water. | D．A teaspoon of baking soda. |
| A．Heat the water. | B．Drink some juice. |
| C．Blow up the balloon. | D．Pull the balloon long. |
| A．To describe an experiment. | B．To introduce a game. |
| C．To produce soft drinks. | D．To save some chemicals. |
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