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¡¾´ð°¸¡¿In my life£¬I get lots of help and love from many people£®Now I want to express my thanks to them£®First£¬I want to thank my parents£®They provide a happy life for me£®They do much for me and give me so much love£®Second£¬I want to thank my teachers£®They are always busy doing their work£®When I have problems with my study£¬they are so patient and helpful£®Third£¬I want to thank my classmates£®They make me feel less lonely£®I will remember the days when we play and study together£®

Thank you£¬my parents£¬my teacher and my classmates£®I hope you are in good health and have a better future£®

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¡¾ÌâÄ¿¡¿The idea that red means stop and green means has influenced our lives in more ways than just traffic signals(ÐźÅ). We have been taught from a young age that the color red means danger and green means it's okay to move forward. But why were those colors chosen for traffic lights in the first place? For something we have to look at every day, why couldn't they have been prettier colors?

Well, it's import to know that before traffic lights for cars, there were traffic signals for trains. At first, railway companies used red to mean stop, white to mean go, and green to mean warn. As you could imagine, trains ran into a few problems with white meaning go. For example, one train mistook a bright star for a white light and something unexpected happened. Because of that, railway companies finally moved green meaning go and used yellow to mean warn. And it's been that way ever since.

Red has always been a color that mean danger, long before cars were even around. This most likely started because it's the color with the longest wavelength(²¨³¤) so it can be seen somewhere farther than other colors.

But, believe it or not, yellow was once used to mean stop. Back in the 1900s, some stop signs were yellow because it was too hard to see a red sign in a poorly lit area. Finally, highly reflective materials(¸ß·´Éä²ÄÁÏ) were developed and red stop signs were born. Since yellow can be seen well at all times of the day, school zones, some traffic signs, and school buses continue to be printed yellow.

So next time you are impatiently waiting at a traffic light, don't get so mad at them, they've certainly come a long way.

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¡¾1¡¿What were traffic signals for before traffic lights for cars?

A. Trains B. Boats. C. Planes D. Bicycles

¡¾2¡¿Which of the following colors meant go at first?

A. Red. B. Yellow. C. White. D. Green.

¡¾3¡¿Why does red mean danger?

A. Because it's the brightest color. B. Because it can be seen far away.

C. Because railway companies say so. D. Because it has the shortest wavelength.

¡¾4¡¿Why are school buses painted yellow?

A. Because yellow is a prettier color.

B. Because yellow once meat danger.

C. Because yellow can be seen well in daytime.

D. Because yellow means it's OK to go forward.

¡¾5¡¿What does the text mainly tell us?

A. How important traffic lights are.

B. Which color has the longest wavelength.

C. What red, yellow and green can be used for.

D. Why traffic lights are red, yellow and green.

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Hou Yi _________ _________the nine suns in the end.

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_______ you are£¬you can't live _______£®

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Look£¡The birds are ________ _________from the grass.

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I _________ _________his name when I couldn't see Tom anywhere.

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Joe Brown is a police artist.Do you k¡¾1¡¿ him£¿And what does he l¡¾2¡¿ like£¿Let me d¡¾3¡¿ him.He is of m¡¾4¡¿ height.But he is a l¡¾5¡¿ heavy.He has short c¡¾6¡¿ brown hair.He always wears a pair of g¡¾7¡¿£®And he has a r¡¾8¡¿ face.He has a big n¡¾9¡¿£®He also has a big m¡¾10¡¿£®Can you remember?

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¡¾ÌâÄ¿¡¿ Recently, Chongqing Three Gorges University has (71) ¡¾1¡¿ (hold) an activity named ¡°Cell Phone Ninja¡±(ÊÖ»úÈÌÕß). They would like their students not(72)¡¾2¡¿ (use) cell phones for 21 days. It is a challenge(ÌôÕ½) (73) f¡¾3¡¿ most students.

The activity started on April 12. (74) E¡¾4¡¿of the students who volunteered to join in this activity got a bracelet (ÊÖ»·). If the students did not use their cell phones, there would be a

photo on the screen of the bracelet to show that. If they used their cell phones, a different photo

would (75) a¡¾5¡¿on the screen of the bracelet. After the last class of every day, the students sent these (76)¡¾6¡¿ (photo) to the school¡¯s public WeChat.

More than 800 students wished to join in this test, and 400 were chosen. After seven days,

only 103 students were left. The test lasted for 21 days (77) b¡¾7¡¿some scientists believe that 21 days is long enough to help form(ÐγÉ) a habit.

According to the teachers in the university, the activity was not a competition.It depended

on students (78)¡¾8¡¿ (they) to make the (79 )¡¾9¡¿ (decide). The teachers hoped their students could form better study habits through activities (80) 1¡¾10¡¿ this one.

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Kim went to a beautiful beach on Monday with his friends.It was sunny and hot.So they had great fun playing in the water.In the afternoon, they went shopping.But the shops were crowded, they didn't really enjoy it.

The next day, it was rainy, so they went to a museum.It was boring.Kim found a small boy crying in the corner.The boy was lost.He helped the boy find his father.Kim was very happy.But he had no money for a taxi.So he had to walked back to the hotel.That made him very tired.

On Wednesday, the weather was very cool.So they played tennis.They played all morning.It was really fun.

¡¾1¡¿On Monday£¬Kim had fun going shopping.

¡¾2¡¿It was very hot on Wednesday.

¡¾3¡¿They went to a museum on Tuesday.

¡¾4¡¿Kim helped a boy find his father and went back to the hotel by taxi.

¡¾5¡¿They played tennis on a cool day.

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¡¾2¡¿Please d________ the class into five groups.

¡¾3¡¿Potato chips were invented by m________.

¡¾4¡¿The young man saved the child. He is a h_________.

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¡¾ÌâÄ¿¡¿¼ÙÉèÄãÊÇLi Ming, ±¾ÖÜĩѧУ¾ÙÐÐÓ¢Óï½Ç»î¶¯£¬ÌÖÂÛÓÎÓ¾°²È«ÎÊÌâ¡£ÇëÄã¸ù¾ÝÒÔÏÂÒªµãÓÃÓ¢Óïдһƪ¼ò¶Ì·¢ÑԸ塣´ÊÊý£º80´Ê×óÓÒ¡£

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´ÊÓïÌáʾ£º °²È«µØsafely£¬ºÏÊʵÄsuitable, ½¨Òé advice£¬´úÌæinstead of , ÌøÈëjump into, Æ£ÀÍ tired

Good morning, everyone! I¡¯m Li Ming. Now I¡¯m going to talk about how to swim safely.

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That¡¯s all. Thanks.

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