—Don't be angry. You'll understand them _______.

—Yes. What a long time!

—So it is. It's made _______ grapes, and they can be made _______ many other foods.

A

    Jupiter(土星) is the fifth planet from the sun and it is the largest one in the solar system. It is about 11 times bigger than the earth. Jupiter's strangest thing is its huge red spot. Pictures taken from space tell us that the red spot is probably a hurricane(飓风). It is so big that the earth would fit right in the middle of it. Sometimes the hurricane looks like a huge oven with orange-red waves (波浪). Some other time the color almost disappears.

    On the earth, hurricanes move. We can watch them travel across water to land. Jupiter's red spot also moves. Scientists say it “walks”. It is carried along by air in Jupiter's atmosphere(大气层).

    So far, Jupiter has been visited by four spacecrafts. All of them flew by Jupiter very quickly. On the next trip to Jupiter, a spacecraft will stay near the planet much longer. New information will be sent back to the earth. Soon scientists will know much more about this strange red spot in the atmosphere.

—_______ the morning of May 13, 1986.

A: Have you learned Topic 2, Unit4?  

B: No, not yet. We will begin to learn it next week.

A: But we've learned it. It's about some  like Edison, a great American inventor.

B: I have read about Edison in a book, so I know  about him.

A: Really?

B: Yes. He invented a lot of things. And they all have  the world.

A: I know he was born in 1847, and died in 1931.

B: So he has been  for more than eighty years.

A: Yes, but we can remember him every day.

B: Sorry, I don't understand  you mean.

A: Do you give your friend a call every day?

B: Yes. Oh, I see. Edison invented the telephone.

—Yes. It's about _______ yours.

    In the eighteenth century, cities became larger and larger. People moved from the countryside to the cities because there was 1 work for them to do in the cities.

    On Sundays and during holidays, they liked to 2 the cities and have a good time in the countryside, but not every 3 had a horse. People needed another kind of transportation. Inventors in many countries tried 4 this problem.

    The first documented bicycle was invented by a German, Baron Von Drais, in the 1810s. It was a walking machine made 5 wood. People pushed their 6 against the ground to move forward. It 7 people to get around parks and gardens.

    In 1865, pedals(踏板) were added to the front wheel. But when people 8 it on stones, they shook a lot.

    In 1870, the first all-metal bicycle 9 rubber tyres(橡胶轮胎) was invented. But the two wheels were not the same 10. The front wheel was much larger than the back one. This machine was the first to 11 bicycle. However, it was hard to ride and it was very 12.

    In the 1890s, chain drive, the pneumatic(充气的) tyre and same-sized wheels made the ride 13 and more comfortable. People loved it 14 it helped them enjoy more free time.

    Bicycling became 15, not just with men but also with women.

B

    With the development of science, more and more students don't like taking notes by hand. Instead, they use digital cameras to take pictures of the words that their teachers write on the blackboard or record what their teachers say in class.

    The children might think there are too many notes to take or their teachers write or speak so fast that they can't take more specific notes. They are trying to find ways to make things easier, so they use digital cameras. In fact, children are very clever to make use of technology.

    But do digital cameras really make taking notes easier?

    Not really. Before you read notes from digital cameras, there are a lot of things you have to do. To begin with, you have to find a computer. Then you need to copy the photos into the computer. Next, you have to find a printer(打印机) to print the photos. Another thing is that you can't hear the sound from the digital cameras clearly because there is usually lots of noise. You will have to listen to it slowly several times before you understand everything.

    In fact, taking notes by hand has many advantages. For example, it can help you remember and understand what you are learning. In order to save time, you can choose the most important things or the things you don't understand to write down. You don't have to write down everything.

    Don't be afraid to take notes by hand. It's really an effective(有效的) way.