In the middle of the 20th century people were worried about whales.The number of whales killed worldwide came up to 66,000 per year.However,people weren't worried about the whale as an endangered animal.Instead,they were worried about the whale industry,which would disappear if there were no whales.In 1946,the International Whaling Commission was established.It limited the whale hunting for every country and controlled the whale industry.But the commission recognized that the limitation wasn't enough.They set a worldwide law against hunting whales with only two exceptions: the hunt for scientific research and "aboriginal whaling".Aboriginal whaling allows some countries to hunt a limited number of whales because it is a part of their culture.Some countries like Japan and Norway don't care about the law;they make excuses to hunt whales and sell the products.They only care about the money.

    Many fishermen complain that dolphins,also a kind of whale,steal their fish.Therefore,they kill thousands of them.In fact,this is not the truth.In reality there are so many fishermen who steal the fish from each other.Some whale hunters say that they catch the animals for scientists.They have to research what whales are eating.For that, they kill them and look into their stomach.The truth is that they only want to sell the meat.Today scientists want to observe live whales for their research.

    Many whale families are not protected and thousands of them are killed.Nobody knows if all whale families would survive,even if humans end all whale hunting today.The pollution of the oceans increases fast and the poison gets into the bodies of the animals.Many of them get sick and die.The human being has killed 90%-95% of many whale families.Others are already extinct.

    Today some international organizations try to protect whales.They make reports to explain how important and endangered whales are.Now people are becoming more interested in whales and a complete new industry has developed,whale watching,which you may want to learn about.

    A major source of teen stress is school exams，and test anxiety is not uncommon.When you recognize your teen is under stress，how can parents help your teen stay calm before an exam?

    Be involved.Parents need to be involved in their teen's work. {#blank#}1{#/blank#} What they look for is your presence­to talk，to cry，or simply to sit with them quietly.Communicate openly with your teen.Encourage your teen to express his/her worries and fears，but don't let them focus on those fears.

    Help them get organized.{#blank#}2{#/blank#} Together，you and your teen can work out a time­table in which he/she can study for what he/she knows will be on the test.

    Provide a calm setting.Help your teen set up a quiet place to study and protect his/her privacy.Give them a nutritious diet.It's important for your teen to eat a healthy，balanced diet during exam times to focus and do his/her best.{#blank#}3{#/blank#} If this happens，encourage your teen to eat light meals or sandwiches.A healthy diet，rather than junk food，is best for reducing stress.

    {#blank#}4{#/blank#} Persuade your teenager to get some sleep and/or do something active when she needs a real break from studying.Making time for relaxation，fun，and exercise are all important in reducing stress.Help your teen balance her time so that she will feel comfortable taking time out from studying to spend time with friends or rest.

    Show a positive attitude.{#blank#}5{#/blank#}Your panic，anxiety and blame contribute to your teen's pressure.Make your teen feel accepted and valued for his/her efforts.Most importantly，reassure your teen that things will be all right，no matter what the results are.

A．A parent's attitude will dictate their teen's emotions.

B．Exam stress can make some teens lose their appetite.

C．They will only make the situation worse.

D．Encourage your teen to relax.

E．The best thing is simply to listen.

F．Help your teen think about what he/she has to study and plan accordingly.

G．Your teen may also make negative comments about themselves.

    Parents may think they're smart about where they store medicines, but their kids are smarter. Nearly 60,000 young children are rushed to the hospital every year after getting into medicines not meant for them, according to a new report from Safe Kids Worldwide.

    The report finds little connection between what parents know about storing medicines safely and what they actually do. Nine out of 10 parents know that medicines should be stored up and away out of reach and sight, but 7 out of 10 of them admit not doing that. They leave medicines out on kitchen counters, sinks and sofas, believing babies and toddlers(学步者)aren't tall enough or strong enough to reach them. Unfortunately, they probably can. Children as young as a month have ended up in an emergency department because they'd been poisoned by getting into a medicine that was left within reach.

Most poisonings related to medicines—particularly among babies and toddlers—occur within their home. Kids develop rapidly and they want to explore their environment. At certain ages they have a lot of hand-to-mouth activity, and so it's very common for them to explore their environment and then try to taste what they find.

    The new Safe Kids worldwide report includes a survey of 2,000 parents with children under age 6. While the number of children visiting an emergency department for accidental poisonings had declined since the 2010 maximum, the decline has slowed in recent years.

    Prescription and over-the-counter medicines cause the most severe poisonings, but vitamins and supplements(补充品)can also cause problems. There are steps families can take to lower the risk for an accidental medicine poisoning.

    Teens who are preparing to undergo cosmetic surgery(整容手术) often have unrealistic expectations. The growing numbers of makeover television shows which make cosmetic surgery seem simple，have encouraged adolescents to pursue surgery to improve their physical appearance. As a result, more teenagers are going under the knife to achieve a desired look.

    When teens feel the need to have plastic surgery, they believe that it is not a huge deal, but they may not be mature enough to make such a life altering decision. If teens feel inadequate before surgery，they will most likely feel disappointed afterwards. Not only is surgery complex and risky for mature adults，it is extremely dangerous for younger people，and some doctors are performing these procedures on kids as young as fourteen！

    The cost of procedures can add up to thousands of dollars. Insurance does not cover the costs of these procedures. Teenagers often pay for surgery themselves 一 a very costly purchase for a young person. Not only can surgery become addictive for insecure teens，the consequence can be disappointing. When surgery takes an unexpected wrong turn, irreparable (不可挽回的）damage can occur. Any surgery on a young，undeveloped person has a risk of complication (并发症）such as infection (感染），which can lead to death.  Even if . there are no complications, there is no guarantee that surgery will provide the perfect nose or sculpted body. No matter how minor the procedure, it is not as effortless as it appears.

    Of course, there are cases where plastic surgery is appropriate. If a child has a serious injury or scarring from an accident，it can be beneficial. In all cases, parents must be involved in the process for the welfare of their child, and must guide them in the right direction. Fortunately, parents or legal guardians (监护人）must sign documents allowing their child to have plastic surgery. Doctors also need to be a part of the decision. Most experienced and trust-worthy physicians turn down the opportunity to operate on a teenager unnecessarily.

    Plastic surgery is a life-changing experience.  Hopefully, more teens will realize that there is more to a person than physical beauty, and learn to accept themselves for who they are.

    Our cities have never been denser, taller, or busier than they are now, and with that, comes the constant battle for land. But if we look at aerial images of any city center, we can quickly spot plenty of unused space — the rooftops.

    So what can we use this precious resource for? In a growing number of high-density cities, some of it is dedicated to recreation — everything from bars and pools, to soccer pitches and running tracks can now be found atop skyscrapers. But when a rooftop offers access to sunlight, there are two more obvious candidates for its use - agriculture and solar power.

    Green roofs have been growing in popularity for more than a decade, and in some cases, growing in scale too. Green roofs can provide a habitat for birds and insects in an otherwise hostile environment.

    Cities can be several degrees warmer than the surrounding countryside. Green roofs come with the added benefit of mitigating the dreaded urban heat island effect. Trees and green spaces can absorb shortwave radiation, and use it to evaporate water from their leaves — a kind of 'double cooling' effect.

    With food security and urban nutrition ever-higher on the agenda for the United Nations, there's also a worldwide movement of using green roofs for hyper-local food production. In regions with suitable climates, hundreds of different vegetables, fruits, and salad leaves can be grown on rooftops.

    But what about solar power? With so many cities now stopping using fossil fuels, and the costs of solar panels dropping dramatically, PV systems have become the 'go to' option for generating distributed power in built-up areas. And, even with standard commercial panels, the energy gains are dramatic. It is estimated that rooftop PV systems could generate almost 40% of electricity demands nationwide.

    There's no doubt that in both cases, a network of 'productive rooftops' could benefit the local community by supplying a portion of a necessary resource — either food or electricity — while also reducing their environmental burden. But is one better than the other?

    This was the question posed by researchers from MIT and the University of Lisbon in a recent paper in the journal Cities. Focusing on the rooftops of a mixed-use neighborhood in Lisbon, they carried out a Cost-Benefit Analysis. Starting with existing data on everything from installation costs and resources used, to carbon footprint and yield, they modelled the impact that each installation would have on the local community over a period of 50 years.

    And by looking at it that way, they concluded that for Lisbon, the use of rooftops for food production could yield significantly higher local value than solar PV energy generation. Of course, this is very site-specific. There is no one-size-fits-all solution to make cities more sustainable, and anyone who tells you otherwise is massively over-simplifying a complex issue. Now, all I hope is that some of those decision makers start using it.

Both humans and animals have enemies. 11 is easy for us to know the difference between our friends and our enemies. But can other animals do the same? Elephants can! They can use their sense of vision and smell to tell the difference between people who mean a threat and those who do not. In Kenya, researchers find that elephants react differently to clothing worn by men of the Maasai and Kamba ethnic groups. Young Maasai men hunt animals and thus mean a threat to elephants; Kamba men are mainly farmers and are not a danger to elephants.

In an experiment conducted by animal scientists, elephants were first presented with clean clothing or clothing that had been worn for five days by either a Maasai or a Kamba man. When the elephants noticed the smell of clothing worn by a Maasai man, they moved away from the smell faster and took longer to relax than when they noticed the smells of either clean clothing or clothing worn by a Kamba man.

Clothing color also plays a role. In the same study, when the elephants saw red clothing not worn before, they reacted angrily, as red is typically worn by Maasai men. Rather than running away as they did with the smell, the elephants acted angrily toward the red clothing.

The researchers believe that the elephants' emotional reactions arc due to their different senses of smell and sight. Smelling a possible danger means that a threat is nearby and the best thing to do is run away and hide. Seeing a potential threat without its smell means that risk is low. Therefore, instead of showing fear and running away, the elephants express their anger and become aggressive.