Pollution inside homes and other buildings kills more than 4 million people each year．Many people die as a result of breathing smoke or from cooking over wood﹣powered of coal﹣powered stoves．

    One way to reduce the number of deaths is through cooking equipment powered by the sun．Crosby Menzies，a solar power expert in a South African company，described his latest solar cooker called the“Sol.4”，”It is four square meters of mirrors，six to eight meters in length．It is quite a large cooler．”

    The“Sol.4”works by reflecting （反射）light from the sun off large mirrors．The mirrors direct （把…对准）the light at a cooking pan．Then the light heats the pan with solar energy．Within two minutes，the pan is hot enough to cook sausages and onions．In just four minutes，water can be boiled．That is as fast as cooking with natural gas or electricity．

    The cooker is also much“friendlier”than other models because people do not have to stand in the sun to use it．And people can prepare meals without having to collect firewood or spend money on coal．Suchindividualswould be less likely to have breathing illnesses from harmful smoke．

    At present，the cooker only works when the sun is shining．But engineers are working on a way to make it work without sunlight．

    Each cooker costs about $2000，which is a large amount of money for most Africans．To solve that problem，Crosby Menzies has crated a non﹣governmental organization called solar Cookers for Africa．It plans to raise money through donations to provide poor people with solar cooking equipment．

Do you feel down more often during the winter months? {#blank#}1{#/blank#} so, you might have winter depression. It's also known to doctors as seasonal affective disoder(SAD, 季节性情绪失调).

SAD usually starts in fall or winter and {#blank#}2{#/blank#} in spring or early summer. As the weather gets colder and the days get {#blank#}3{#/blank#}, you feel more tired, sleepy and even hopeless from time to time.

However, we still don't know the {#blank#}4{#/blank#} for SAD. Some scientists think that hormone(荷尔蒙) changes can cause this kind of problem. During winter, it {#blank#}5{#/blank#} dark outside for much of the day. This causes the brain to make more melatonin(褪黑素). This hormone makes you feel sleepy and less {#blank#}6{#/blank#}.

Getting more sunlight is the {#blank#}7{#/blank#} way to deal with SAD. Doctors say people should spend at least some time {#blank#}8{#/blank#} every day during the winter. "Light therapy(疗法)", or using {#blank#}9{#/blank#} lights at home to simulate(模仿) natural light, can also help. But if you still feel deeply depressed, you should go to a {#blank#}10{#/blank#}.

Welcome to Wanda Cinema. We are ON SALE this month! You can not only enjoy the biggest screenshere, but also the most comfortable seats and the latest movies!