As they migrate(迁移), butterflies and moths(飞蛾) choose the winds they want to fly with, and they change their body positions if they start floating in the wrong direction. This new finding suggests that insects may employ some of the same methods that birds use for traveling long distances. Scientists have long thought that insects were simply at the mercy of the wind.

    Fascinating as their skills of flight are, migrating behavior has been difficult to study in insects because many long distant trips happen thousands of feet above ground. Only recently have scientists developed technologies that can detect such little creatures at such great heights.

    To their surprise, though, the insects weren't passive but active travelers on the winds. In autumn, for example, most light winds blew from the east, but the insects somehow sought out ones that carried them south and they positioned themselves to navigate(导航) directly to their wintering homes.

    Even in the spring, when most winds flowed northward, the insects didn't always go with the flow. If breezes weren't blowing in the exact direction they wanted to go, the insects changed their body positions to compensate(抵消). Many migrating birds do the same thing.

    The study also found butterflies and moths actively flew within the air streams that pushed them along. By adding flight speeds to wind speeds, the scientists calculated that butterflies and moths can travel as fast as 100 kilometers an hour. The findings may have real-world applications.

    With climate warming, migrating insects are growing in number. Knowing how and when these pests move could help when farmers decide when to spray their crops.

    Perhaps at one point in time, it was acceptable to start any letter or e-mail with “To Whom It May Concern.”{#blank#}1{#/blank#} Starting your cover letter or e-mail for a job this way might give off the impression that you didn't do your research on who you're writing to{#blank#}2{#/blank#}After all, people who address other people by their names when writing and speaking to them tend to be more pleasant.

    {#blank#}3{#/blank#}It can be used in letters of recommendation or reference, formal complaints（抱怨）made to a company, letters of introduction, and letters of interest.

    Grammarly uses the example of needing to write a letter of recommendation, for a colleague who will have to make several copies to distribute to interviewers{#blank#}4{#/blank#}“In most cases, though, try to narrow your focus rather than cast a broad net,” notes Grammarly.”Ask yourself. Who does this e-mail concern? If you can honestly answer 'Anyone, 'then feel free to use “To Whom It May Concern.” （These are the things you should never say in your cover letter.）

    If you do happen to find that using “To Whom It May Concern” is appropriate, don't make grammar mistakes, for example, letters or punctuation.{#blank#}5{#/blank#}

A. However, it maybe interesting.

B. Those times have changed, though.

C. Making mistakes in writing will surely get you low scores.

D. It's also very impersonal, which some employers might not appreciate.

E. In that circumstance, sending and receiving letters is more of a formal greeting.

F. You might want to take note of other common errors you might be committing, too.

G. But according to Grammarly, there are four times when it's OK to use this greeting.

    People all have good days and bad days. And some of the bad days happen due to events beyond your control.{#blank#}1{#/blank#}One way to increase the possibility that you have a good day is to join in “gratification(喜悦)” activities , which you enjoy and you're good at.{#blank#}2{#/blank#}However, if you don't have the type of job, you can take part in other activities and find the same result.

    {#blank#}3{#/blank#}There are many little pleasures you can add to your life, such as tea, a warm bath, a walk in the park and so on. As long as you enjoy them, they can really brighten your every day. Laughter is also part of having a good day. That's why it's important to do what you can to create joy for you.{#blank#}4{#/blank#}After all, if you are humorous, you can more easily center on fun things.

    If you don't have much time, one way can be used during a stressful day.{#blank#}5{#/blank#}You should achieve this by making your plan flexible and checking that everything in your plan is necessary. Being busy is okay, but wasting time and energy on too many unnecessary things can just lead to stress.

A. Often, bad days come from overweight stress.
B. Some people experience joy and happiness at work.
C. Good moods enable us to notice more chances.
D. Life's pleasures are also able to add a quick lift to your mood.
E. However, people do have power in creating better days.
F. So it's important —especially if you're a busy person—to stay balanced.
G. Besides, developing a sense of humor also helps you have a good day.

    New York City is a world capital in every sense of the word—it's a cultural and economic powerhouse, and arguably the most influential city on the planet. But it wasn't always this way, as the following cities once dominated the world around them.

    Djenne­Djenno

    In the flood lands of the Niger delta people have been building houses and other structures with clay for centuries. The town of Djenne­Djenno is made entirely out of clay. It was inhabited as far back as 250 BC, and became an important link in the trans­Saharan gold trade(跨撒哈拉黄金交易). Constructed on hills called " toguere", the city managed to escape the marshy(沼泽 ) landscape and annual floods produced by the rainy season. Djenne­Djenno is believed to be one of the earliest settlements in the sub­Saharan region, and is considered by some to be "the typical African City".

    Archeological evidence shows us a continuous human presence in the area up until the 14th century AD, when people moved to the nearby town of Djenne, founded in the 11th century. Further evidence points out that even before the city's construction, the Bozo people were growing wild rice in the region. In the 13th century AD, with King Koumboro's conversion to Islam, its palace transformed into a mosque.

    Carthage

    Legend has it that Carthage was founded by Queen Dido of the Phoenicians. She fled the city of Tyre located in present­day Lebanon in order to escape the hatred of her brother Pygmalion, who was her rival to the throne. Along with a group of settlers, she traveled a great distance by sea and landed in North Africa, where she met King Iarbas. He offered to give them land in order to build a settlement, but no bigger than the surface covered by the hide(牛皮) of an ox. They cleverly cut the hide into thin strips and were able to enclose a fairly large area of land. On this land, the mighty city of Carthage was built.

    These stories are most likely just that, but the fact that the Phoenicians built the city around 760 BC is true. Located in such a good position—in the middle of the Mediterranean, close to Sicily, Sardinia and Corsica, and a pretty good distance from Egypt—helped make Carthage a leading trade center and military power. The population soon reached half a million citizens and, in order to house them all, buildings were all built five or six stories tall. Carthage was the first city in ancient times to have a centralized sewage system, linking all buildings within the city walls. The most notable of structures among the ruins was the " Thophet", which is believed to be an altar(圣坛) for child sacrifice.

    Tenochtitlan

    Tenochtitlan was the capital city of the Aztec Empire. It was built on an island surrounded by Lake Texcoco deep inside the jungles of Central America. By the time the Spanish conquerors were aware of its existence, the population was around 200，000. This was a city very different from what the Europeans were used to. Founded in 1325 AD, the Aztec capital was joined to the mainland by three causeways(堤道). It was laid out in straight street grids and had enormous pyramids at its center, which were surrounded by the skulls of the dead and ceremonial sculptures.

Making Short Videos

    "A picture is worth a thousand words or so", they say. Well, motion (运动) pictures can contain even more memories. {#blank#}1{#/blank#} Here are some apps you can use to make your own short videos.

    Qupeiyin.cn

    Reciting lines from movies is an effective and classic way to learn English. So what if you could dub (配音) recordings accompanied by movie clips (剪辑) and then share them with friends? {#blank#}2{#/blank#} You name it. By contributing your voice, you can either mimic (模仿) the original soundtrack or create something completely new of your own.

    Shorts

    {#blank#}3{#/blank#}With the help of the Shorts app, you can make pictures in your album into a slide show. Choose from any of the off-the-shelf themes—"holiday", "travel", "friendship" and "party" for example—each matched with its own theme music and slide background. But if you're not satisfied with the combinations, feel free to do a little change by adding text to the pictures or replacing the music with something in your own playlist.

    Viva Video

    Video making and editing once seemed awfully hard. {#blank#}4{#/blank#} But this app will ease you into the field with straight-forward functions and clear direction to help you "create your own video story". Apart from filter, stickers and text, the coolest part of this app is that you can write the narratives yourself and add your own voice to the video. {#blank#}5{#/blank#} Viva Video requires a relatively powerful phone to run smoothly.

    For nearly thirty years I did parent programs in all of the fifty states, and regardless of the community, there was always a shortage of fathers attending, usually by a 10:1 (mothers、 fathers) ratio. Maybe they were all tending to business, and they obviously didn't think school was any of their business.

    The world is now flat. How's that for a sea change? As Thomas Friedman described it in his book The World Is Flat twenty-five years ago, the power structure of the world consisted of highs and lows. The countries with the power and knowledge were at the top of the mountains and the rest were down in the valleys. A handful of countries (the United States, Britain, Germany, and Japan) ruled the world's economy because they monopolize (垄断)the information and power.

    Then came the Internet. Suddenly the countries down in the valleys were connected to the information network and the work flow. These included India, Eastern Europe, South Korea, Brazil, and China. Don't believe it? Walk into a supermarket and pick up any ten toys, checking each for where it was made. My last count: China, ten out of ten. The world's workforce became "flattened". No more disconnected valleys.

    Since 2000, U.S. manufacturing has lost six million jobs, one-third of its workforce, most of them males. For the first time in history, women hold the majority of jobs in the U.S.

    The only people who don't understand the sea change in business are the fathers and sons still clinging to the image of the male who doesn't need to play school—just play ball. It's been thirty years since that idea had any wings, but too many males are still trying to make it fly. Once the only thing that mattered for men was what they could get out of the ground with their hands. Now it's what they can get out of their heads that counts. And without classroom success, today's male faces an impossible challenge from both intelligent women on the home front and foreigners willing to do the same job for less while sitting in an office in Bangalore or Singapore.