skills, learn, what, did, basic, he(?)
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computer games, don't, on, time, waste(.)
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John, may, speak to, I(?)
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根据短文内容及所给提示，补全文中单词或用所给单词的正确形式填空。
Dear Jenny,
How is everything? I hear that you feel lonely because you don't share t1. same interests with your classmates and have nothing to talk about. I'm writing to offer you some a2.. To make friends, you must be 3.(friend). Everyone likes a nice girl with a smile. So first, ask a kind question to start chatting. 4.(two), find out what interests 5. (they) and talk about that. 6. (final), talk to as many people as possible. Say hello 7. someone new. Sit with different 8. (group) of people. 9. one person doesn't want to start a conversation, find someone else to chat with. Don't just think about being lonely. Do something about it! 10. (do) things differently will help to produce different results.
Hope these will help you.
Yours,
Lucy
Many people know that rubbish is a big problem on planet Earth. What many people don't know is that junk has become a problem in outer space too.
According to BBC News, there are more than 22, 000 pieces of space junk floating around the earth. And these are just the things that we can see from the surface of the earth by telescopes (望远镜). There are also millions of smaller pieces of junk that we can't see.
Objects, like bits of old space rockets or satellites, move around the planet at very high speeds, so fast that even a very small piece can break important satellites or become dangerous to astronauts. If the tiniest piece of junk crashed into a spaceship, it could damage the vehicle (交通工具).
To make things worse, when two objects in space crash, they break into many smaller pieces. For example, when a U. S. satellite hit an old Russian rocket in 2009, it broke into more than 2,000 pieces, increasing the amount of space junk.
To reduce additional space junk, countries have agreed that all new space tools can only stay in space for 25 years at most. Each tool must be built to fall safely into the earth's atmosphere after that time. In the upper parts of the atmosphere, it will burn up.
Many scientists are also suggesting different ways to clean up space junk. In England scientists are testing a metal net that can be fired into space junk. The net catches the junk and then pulls it into the earth's atmosphere to burn up. The Germans are building robots that can collect pieces of space junk and bring them back to Earth to be safely destroyed.
"The problem is becoming more challenging because we're sending more objects into space to help people use their mobile phones and computers," says Marco Castronuovo, an Italian space researcher.
"The time to act is now. The longer we leave the problem, the bigger it will become," he says.
1.Junk has become a problem in ________ too.
2.What would happen if the tiniest piece of junk crashed into a spaceship?
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3.Why have countries agreed that all new space tools can only stay in space for 25 years at most?
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4.找出并写下第六段的主题句
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5.将文中画线句子译成汉语。
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There's much to see under the sea, but you need to remember that light behaves differently in water than in air. The objects appear closer to you than they exactly are. You might find yourself reaching out to touch something and completely missing it.
Objects under water will appear larger than they would on the surface, too. Be careful not to tell any stories about the big fish that got away. That fish might not be so big after all! It's just because sometimes things can seem to be as much as about 33 percent bigger in water!
What's more, in deeper water, colors just don't seem as bright. In fact, it looks as if some colors are missing. Remember the color of an object results from the wavelengths (波长) of light that are reflected (反射) from its surface. And light is taken in as it moves down through the water.
Swimmers wear wet suits to keep warm underwater. Let's take a bright red, yellow, and blue wet suit as an example. These colors are hard to miss on the surface of water. Watch carefully the changes in color as you descend in the water. The red part now looks almost black because the red light wavelengths, the longest among these three colors, are missing. As you go down deeper, the same thing will happen to the yellow part and in the end to the blue part. Even at a place of about 6 to 9 meters underwater, you will look terrible, like a ghost! And you have to wait for your return to the surface to enjoy the bright colors again!
1.You miss the object underwater when you want to touch it because________.
A.your eyesight is quite poor
B.you are not quick enough
C.it is not as close as it seems
D.it disappears very quickly
2.The example of the wet suit is used to explain the change of________of an object underwater.
A.the color B.the size C.the position D.the weight
3.The underlined word "descend" probably means________ in this passage.
A.go out B.go up C.go in D.go down
4.Which of the following is true?
A.The wavelengths of red light are longer than those of blue light.
B.A four-meter-long fish looks three meters long underwater.
C.Much water will be taken in by the swimmer deep in the water.
D.You will see a ghost if you go as deep as 6 to 9 meters into the sea.
5.The best title of this passage is________.
A.The Standard of Color Underwater B.The Direction of Light Underwater
C.The Brightness of Color Underwater D.The Behavior of Light Underwater
