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    Look! Students are learning folk {#blank#}1{#/blank#} at school. They are {#blank#}2{#/blank#}a middle school in Nanshan. The school has offered folk art classes since 2016. It invites artists to teach students embroidery (刺绣)and pyrograph (烙画). Pyrograph is a kind of art in which the artist draws on pieces of wood or {#blank#}3{#/blank#}objects by using burn marks. Students {#blank#}4{#/blank#} use gourds (葫芦)for their pyrography classes. The classes can help students learn more about Chinese traditional folk art and pass {#blank#}5{#/blank#} on.

    Is there something strange high up in the world's {#blank#}1{#/blank#} mountains? If so, is it a big bear? Is it monkey? Or is it a kind of man?

    No one knows. This mystery has puzzled the world for years.

    In 1887, a mountain climber found large footprints in the snow. They looked like the footprints of a very large man. But men don't walk {#blank#}2{#/blank#} shoes in the snow!

    In 1906, another climber saw more than footprints. Far off, he saw a very large animal standing on two legs. As he watched, it ran very {#blank#}3{#/blank#}.

Fifteen years later, newspaper had new stories about the "something". A mountain climber said he had seen the "{#blank#}4{#/blank#}" walk slowly across the snow, far below him. He said it looked like a very large man.

    From then on, more and more people had stories to tell. But not until 1951 did a mountain climber bring back of large footprints. "The pictures showed clearly {#blank#}5{#/blank#} the Snowman walked on two legs." So it was not a bear or a monkey. Could it be an ape man? The mystery grew! And the mystery keeps growing. Some day we may {#blank#}6{#/blank#} what it is that makes the large footprints.

    Many students aren't getting enough sleep at night, which means they end up feeling sleepy during class. {#blank#}1{#/blank#}during the day may be a solution.

    According to Forbes, a mid-afternoon nap can {#blank#}2{#/blank#}, increase your energy and help you study even better. But {#blank#}3{#/blank#}should a nap last? The proper time should be between 10 and 30 minutes, Peter Venn, a sleep expert said.

    Sleeping for {#blank#}4{#/blank#}, such as five minutes or so, is not helpful. That's just not enough time to rest. But if you sleep for too long, you may {#blank#}5{#/blank#}feeling uncomfortable.