Dujiangyan is the oldest man-made water system in the world, and a wonder in the development of Chinese science.{#blank#}1{#/blank#} (build) over 2, 200 years ago in what is now Sichuan Province in Southwest China, this amazing engineering{#blank#}2{#/blank#}(achieve) is still used today.

    In ancient times, the region in which Dujiangyan now stands{#blank#}3{#/blank#}(suffer) from regular floods caused by overflow from the Minjiang River.{#blank#}4{#/blank#} (help) the victims of the flooding, Li Bing, the region governor, together with his son, decided to find a solution. Li Bing, the region governor, together with his son, decided t find a solution. Li designed a series of channels built at different levels along Mount Yulei that would take away the floodwater while leaving the river flowing naturally.{#blank#}5{#/blank#} (good) still, the extra water could be directed to the dry Chengdu Plain, making{#blank#}6{#/blank#}suitable for farming.

    Once the system was finished, no more floods occurred and the people were able to live {#blank#}7{#/blank#}(peaceful). Today, Dujiangyan is admired by scientists from around the world because of one feature. Unlike modern dams{#blank#}8{#/blank#} the water is blocked with a huge wall, Dujiangyan still lets water flow through the Minjiang River naturally{#blank#}9{#/blank#} (enable) ecosystem(生态系统) and fish populations to exist{#blank#}10{#/blank#}harmony.

    Traditional Chinese medicine has been practised for around 3, 000 years, but it {#blank#}1{#/blank#} (be) relatively recent in the West, and acupuncture(针灸)only really became well known in the West in the 1970s as people began to travel {#blank#}2{#/blank#} (much)frequently between the two areas of the world.

    A significant event in the history of acupuncture {#blank#}3{#/blank#} (come)in 1971, when a journalist from the New York Times had his appendix(阑尾) {#blank#}4{#/blank#} (remove)in China, when on a trip to the country with Henry Kissinger, the Secretary of State for the USA. Surgeons used acupuncture to deaden the pain of the operation, {#blank#}5{#/blank#}greatly impressed Kissinger.

    Although at first doctors in the West were often sceptical of the {#blank#}6{#/blank#} (medicine)value of acupuncture, in the last few years it has become more established {#blank#}7{#/blank#} an alternative to Western medical treatments, since clinical tests have shown that acupuncture is effective for  {#blank#}8{#/blank#} number of conditions.

    In the West, the treatment is often used {#blank#}9{#/blank#} (relieve)headaches, dental pain, back pain and arthritis, and to treat depression, asthma, stress, high blood pressure and anxiety. Cherie Blair, a well-known human rights lawyer and the wife of the British Prime Minister, was recently spotted {#blank#}10{#/blank#} (wear)an acupuncture needle in her ear, suggesting that she uses the treatment to deal with stress.

    Tony and I are good friends. We tried to walk across the United States of America. We're not exactly sure{#blank#}1{#/blank#} we were doing it. Part of it was to test ourselves; to see if we could face the challenges. When I was{#blank#}2{#/blank#} teenager I often daydreamed that I was going to walk across the United States{#blank#}3{#/blank#} I graduated from high school.{#blank#}4{#/blank#} , I didn't do that. Before I knew it I was in my thirties, married,{#blank#}5{#/blank#} （have） a job, yet still had this idea in my mind with each{#blank#}6{#/blank#} （pass） year. I figured I was too old and my opportunity had passed. Then, a few years ago, I met Tony,{#blank#}7{#/blank#} was in his thirties and quit his job as a civil engineer in New York City to walk across the United States. He wasn't doing it for a cause{#blank#}8{#/blank#} as part of an organization. He was doing it{#blank#}9{#/blank#}（simple） because he loved to walk and discover. The idea was back and I no longer had an excuse. We planned on averaging 20miles a day and taking some days off to rest, so we expected the walk to take about 6months realizing it could take{#blank#}10{#/blank#} （long）. We were in no hurry: The total distance would have been about 3,100miles.

China's Chang'e 5 mission successfully delivered samples(样本)of moon rock and dust to Earth on December 17, 2020. It{#blank#}1{#/blank#}(mark) the first time in 4 years that moon rocks have been brought back to our planet, since the Soviet Union's I.una 24 mission in 1976.

The sample capsule landed in Inner Mongolia{#blank#}2{#/blank#}a little after 2：00 a. m. Recovery teams in trucks and helicopters located the landing site shortly after and secured the sample{#blank#}3{#/blank#}(contain).

While Apollo-era moon rocks are estimated to be about 3 to 4 billion years old, the material{#blank#}4{#/blank#}(collect) by Chang'e 5 is from a site in the northwest region of the moon's near side. This area was formed{#blank#}5{#/blank#}(late), and the rocks here are thought to be only about 1.2 billion years old. That means scientists could learn more about the evolution of the moon and test out new techniques for estimating the age of geological samples from other{#blank#}6{#/blank#}(planet)and moons(卫星).

The Chang'e lunar program, {#blank#}7{#/blank#}includes landing two lunar rovers(月球车)on the moon's surface, has been{#blank#}8{#/blank#}(remarkable)successful. Although Chang'e 5 was a short mission, it's one of{#blank#}9{#/blank#}most complex projects undertaken by the Chinese space program so far. The country is far from done with the moon—Chang'e 6, a second lunar sample return, is scheduled{#blank#}10{#/blank#}(launch) in 2023 or 2024.