Leonardo da Vinci lived in Italy in the fifteenth and sixteenth centuries. He was a student in Florence, where he studied painting and design. He began a lot of paintings, but he {#blank#}1{#/blank#} (not finish) many of them. His picture of the Mona Lisa is {#blank#}2{#/blank#} (famous) one in the world.

    Leonardo was interested in many things. He wanted {#blank#}3{#/blank#} (know) about everything he saw. He thought the sun doesn't go around the earth. He wrote music. He designed a {#blank#}4{#/blank#} (fly) machine 400 years before the first one flew. Many people didn't understand his ideas. It is difficult {#blank#}5{#/blank#} (think) that one man can do so much.

    "You'll think twice about plucking your eyebrows (拔眉毛) {#blank#}1{#/blank#} you find their important role," says Greg Foot. They are one of {#blank#}2{#/blank#} most expressive(有表现力的) parts of our bodies. {#blank#}3{#/blank#} your eyebrows, you can tell your feelings to other people. {#blank#}4{#/blank#} is that their only purpose (目的)?

    Over several thousand {#blank#}5{#/blank#} (year), we have lost lots of body hair, so it's strange that hair still {#blank#}6{#/blank#} (remain) on our brows. Some scientists say that eyebrows mainly work as {#blank#}7{#/blank#} special form of protection for the eyes. In fact, their job is so {#blank#}8{#/blank#} (importance) that some researchers are sure that if we didn't have {#blank#}9{#/blank#} (they), we'd have evolved (进化) some other facial features to {#blank#}10{#/blank#} (do) the same task.