As the population of the planet increases, so does the number of homes, business, parking lots, schools, airports and roadways. All these structures use electricity and need to be lighted. Humans demand light. They want their homes more comfortable and they want their streets safe. The problem is that researchers are finding that all the light is having a negative effect on humans and wildlife as well.

    Less than 10 years ago I drove to a thinly populated section of my own, lay down in the middle of the road and watched an attractive meteor shower(流星雨). If I did that today, I wouldn't be able to see the meteor shower.

    Nowadays scientists are finding light pollution can be almost as bad as carbon dioxide （二氧化碳）pollution. One of the saddest parts of light pollution is that most of it is unnecessary and most of the outdoor light that we use is wasted. One only needs to look at a row of street lights to see how much of the lights shines upwards and lights the sky: a total waste of electricity.

    Additionally, the production of electricity creates pollution by releasing greenhouse gases. This affects the air we breathe and our quality of life.

    Scientists are also studying the effects of light pollution on wildlife. Thousands of birds die each year when they crash into highly lighted buildings, as they become puzzled by the light. It has been long known that tiny baby sea turtles become lost and follow the light on the shore instead of heading towards the sea.

    Fortunately, light pollution is one of the easiest sources of pollution that can be corrected without a negative effect. Following some guidelines and a little searching on Google can give you many ideas on how to reduce your contribution to light pollution.

    Doctors say anger can be an extremely damaging emotion, unless you learn how to deal with it. They warn that anger can lead to heart disease, stomach problems, headaches, emotional problems and possibly cancer.

     {#blank#}1{#/blank#}Some people express anger openly in a calm reasonable way. Others burst with anger, and scream and yell. But other people keep their anger inside. They can not or will not express it. This is called repressing anger.

    For years many doctors thought that repressing anger was more dangerous to a persons health than expressing it. They said that when a person is angry, the brain releases the same hormones (荷尔蒙). They speed the heart rate, raise blood pressure, or sugar into the blood, etc.{#blank#}2{#/blank#}

    Some doctors say that both repressing and expressing anger can be dangerous. They believe that those who express anger violently may be more likely to develop heart disease, and they believe that those who keep anger inside may face a greater danger of high blood pressure.

    {#blank#}3{#/blank#} They say the first step is to admit that you are angry and to recognize the real cause of the anger, then decide if the cause is serious enough to get angry about. If it is, they say, “{#blank#}4{#/blank#}Wait until your anger has cooled down and you are able to express yourself calmly and reasonably.”

    Doctors say that a good way to deal with anger is to find humor in the situation that has made you angry.{#blank#}5{#/blank#}

A. In general the person feels excited and ready to act.

B. They said that laughter is much healthier than anger.

C. Expressing anger violently is more harmful than repressing it

D. Anger may cause you a cancer.

E. Do not express your anger while angry.

F. Anger is a normal emotion that we all feel from time to time.

G. Doctors say the solution is learning how to deal with anger.    

    Looking back at my younger years,I am sometimes amazed at how life has turned out.{#blank#}1{#/blank#}The only thing that stays the same is who I am,my values,and my interests.If I could go back in time and hang out with my younger self for a day,here's what I would tell her.

    Everything happens for a reason.

    Without mistakes and failure,you would never have learned.Without pain,you would never have grown.Once you understand this,you will know that everything comes in to serve a purpose.So don't think that life is unfair, because everything happens for a reason.{#blank#}2{#/blank#}

    Focus on one thing at a time.

    It is not surprising that many of us are doing too many things at once.We need to make ends meet.But if you are working three jobs at a time,it is not likely that you will succeed at any of them.You have to keep your eyes on the big picture.You have to ask yourself: What exactly do you want to achieve for the next 10 years?Focus on one thing at a time.{#blank#}3{#/blank#}

    {#blank#}4{#/blank#}

    You might be graduating or have hit a turning point with your career.You might feel a bit lost and unsure of where to go.It's okay.Go out there and try as many different things as you can.Don't ever feel like you're wasting your time.Enjoy the journey.Every little path will lead you somewhere.And looking back,you will be able to connect the dots.It will all make sense.

    Don't try too hard with people.

    Don't worry if you feel like it's hard to make new friends.{#blank#}5{#/blank#}It might take a while until you find new best friends and a mate for life,but when you do,you will know it.It's not hard work.So,just do your things and be yourself.

A. Achieve your goals one by one.

B. You can plan everything ahead.

C. Only time will tell what life will teach us.

D. Just be yourself and be as open as you can.

E. It's okay to be unsure about your purpose in life.

F. Nothing is exactly what I had originally planned for.

G. Don't worry too much about a decision you have to make.

    Sharpshooters refer to those who are skilled at firing a gun and accurately hitting what they are aiming at. However, some fish are also called amazing sharpshooters. People wonder how they hit their targets without using tools? By spitting! The fish shoot so accurately that they rarely miss their target.

    These amazing fish are archerfish (印度射水鱼).There are several different types of archerfish living in Southeast Asia. They spit at their dinner to catch it. To catch dinner, a fish first sets itself in a certain place, for example just below the surface of the water. It puts the tip of its mouth so it barely breaks through the water. Then, the fish waits for an unsuspecting insect to land on a leaf or branch hanging over the water.

    When an unsuspecting, or unknowing insect lands, the fish attacks. The fish squeezes its gill (腮)covers very rapidly, which forces water into the fish's mouth. In the roof of its mouth the fish has a groove (槽）. The fish forms the small groove and its tongue into a narrow tube by pressing its tongue up against its groove. The water forced into the fish's mouth is forcefully pushed out of the fish's mouth through the tube. Archerfish have been known to send a stream up to 5 meters (16 feet). However, archerfish can only shoot insects up to 1-2 meters (3-6 feet) away due to their limited accuracy.

    When the unsuspecting insect is hit with a sudden stream of water, it is knocked into or falls into the water. Once in the water, the insect becomes dinner. Archerfish learn how to spit when they are young. They get more accurate with practice. Adult archerfish rarely miss.

    Within a meter, archerfish will often spring out of the water and grab an insect in their mouths.

    Alison Malmon was ending her freshman year at the University of Pennsylvania. US, when she got the news: Her older brother Brian, a student at Columbia University; was suffering from mental illness.

    Inspired by this, Malmon formed a group at her university to organize students to talk openly about mental health. It soon blossomed into a national organization that today has more than 450 campus chapters. Leaders with the organization spend their time talking with college students about the pressure that today's young people face.

    "What you hear often is just a need to be perfect," said Malmon, "and a need to present oneself as perfect." A new study in the UK proved that this need for perfectionism is simply part of today's society. In the study, two researchers studied more than 40,000 students from the US, Canada, and the UK. They found that what they called "socially-prescribed (社会定向型的) perfectionism" increased by a third between 1989 and 2016.

    Lead researcher Thomas Curran said that while so many of today's young people try to present a perfect appearance online, social media isn't the only reason behind this trend. Instead, he said, it may be driven by competition in modem society, meaning young people can't avoid being sorted and ranked in both education and employment. That comes from new normal situation like greater numbers of college students, national examination and parenting that increasingly emphasizes success in education.

    For example, in 1976, half of high school seniors expected to get a college degree of some kind. By 2008, more than 80 percent expected the same. The researchers also said changes in parenting styles over the last two decades might have had an impact. As parents feel increased pressure to raise successful children, they in turn pass their "achievement anxieties" onto their kids through "too much participation in their child's activities or emotions

    Those in the mental health community like Malmon say they're concerned about the impact the culture of perfectionism has on mental health on campuses. "Mental health has truly become this generation's social justice (公正)issue," she said. "It's our job to equip them with the tools and to let people know that it's not their fault."

We high school students do have some growing pains,but we can get rid of them correctly and {#blank#}1{#/blank#}(wise).First, some of us{#blank#}2{#/blank#}(be) upset about our appearance.I don't think it is important all and there is no need to care about it. Actually,it is one's inner beauty{#blank#}3{#/blank#}matters. Second, we sometimes cannot{#blank#}4{#/blank#}(understand) correctly by our teachers,  parents and classmates.Faced with this, we can find a right time to have a heart-to-hear talk with {#blank#}5{#/blank#}(they), trying to remove the misunderstanding.Some of us have fewer friends{#blank#}6{#/blank#}would like to listen to our deepest feelings and thoughts.I think being open-minded and friendly will do you good. Third, we may fall behind others,which makes us{#blank#}7{#/blank#}( stress).Well, we can encourage ourselves to work efficiently, full of {#blank#}8{#/blank#}(determine). At last,some of us don't have much pocket money, so they feel unhappy. Isn't it strange?{#blank#}9{#/blank#}my view, as long as we have some, that's enough. And then, we can learn to be independent by {#blank#}10{#/blank#} some part time jobs, earning some extra money.