The "One Belt One Road" strategy(策略) proposed by President Xi Jinping has drawn public attention to {#blank#}1{#/blank#} oldest and longest trade route-Silk Road．The term in a narrow sense refers to an ancient overland trade route {#blank#}2{#/blank#} （form） in the Western Han Dynasty．This route stretched 4, 350 miles from Chang's an to western China，central Asia and even to Europe, {#blank#}3{#/blank#} （enable） theses regions to have better communications in diplomacy（外交），business and culture．

    China was the first country in the world to breed silkworms and produce silk fabric．This craft skill reached a {#blank#}4{#/blank#} （fair） advanced level in the Zhou Dynasty．As a major export to Europe， "silk" was used to name this great route by a German geographer．China's silk{#blank#}5{#/blank#} （introduce） into western countries through this old trade route．People were {#blank#}6{#/blank#} （familiar）with his product at the beginning，and made many guesses at {#blank#}7{#/blank#} it was produced．According to the record， the idea that silk was picked from trees was widely accepted by folks in Europe．

    {#blank#}8{#/blank#} （garment服装）made of this fabric were always best sellers，and were considered a social status symbol．Ever the gorgeous Egyptian queen，Cleopatra，was also a big fan of the silk．This fascination led {#blank#}9{#/blank#} an increasing demand for this product，and promoted the {#blank#}10{#/blank#}（develop） of this trading route．

    Spring is coming. Everything is waking from its winter sleep. The fields {#blank#}1{#/blank#}(dress) in a fresh robe of green. The wild flowers begin to peep forth(隐隐露出). Birds sing among the trees, and begin to get their nests ready {#blank#}2{#/blank#} summer. Men are now sowing seeds in the fields. The days are {#blank#}3{#/blank#}(warm), for brighter sunshine has come again. Everything is full of life and joy.

The college entrance examination is just around the corner. {#blank#}1{#/blank#} (assign) and tests will keep many of you up late at night, and you may plan to make up for your{#blank#}2{#/blank#} (lose) sleep during the weekends. But is it useful?

A study shows that the habit of sleeping in{#blank#}3{#/blank#} weekends doesn't fix the damage done by a lack of sleep during the week. Even {#blank#}4{#/blank#} (bad), it may damage your health.

In the study, {#blank#}5{#/blank#} was conducted over 10 days, 36 healthy young men and women with different sleep requirements {#blank#}6{#/blank#} (divide) into three groups. The researchers found that people who lacked sleep ate more snacks and gained {#blank#}7{#/blank#} (weigh) quickly. That could be partially due to the shifting of the{#blank#}8{#/blank#} (biology) clock and changes to certain body hormones especially hunger hormones.

And {#blank#}9{#/blank#} they tried to sleep for as long as they wanted to on weekend, it was still insufficient(不够的) to meet standard sleep time because they found it difficult to fall asleep. Moreover, they were more likely{#blank#}10{#/blank#}(show) increased sensitivity (敏感性) to insulin(胰岛素) in both their muscles and their livers.