Many teachers believe that hands－on experience is the {#blank#}1{#/blank#}(good) way to learn. A group of students in the United States are putting that belief to the test. They {#blank#}2{#/blank#} (success) designed and built a robot for discovering unexplored mines {#blank#}3{#/blank#} the bottom of the sea. Students made the robot {#blank#}4{#/blank#}(answer) a challenge from the U．S. Department of Defense.

    The students recently tested the underwater vehicle {#blank#}5{#/blank#}(call) PerseusⅡin a 95－meter－long tank of water at the Stevens Institute of Technology.

    The robot costs about $15,000 to build. The students use a video game control to direct {#blank#}6{#/blank#}(it) movements in the tank. What's more, devices known as Japters {#blank#}7{#/blank#} (able) the robot to go up, down and toward its target in the water. Video cameras on the robot send images back to a computer through a 13－meter－long cable. Perseus Ⅱ,{#blank#}8{#/blank#}the students worked up to 20 hours a week to design and build, also has {#blank#}9{#/blank#} set of lasers (激光), which are used to measure the size of an object.

    DeLorme supervised the project from {#blank#}10{#/blank#}(begin) to end. He says the specialized requirements of robots were demanding.

    I enjoyed English, biology, and chemistry at school, but which one should choose {#blank#}1{#/blank#} (study) at university? I did not know the answer until one evening when I sat down at the computer to do some research on great women of China.

    By chance I came across an article about a doctor {#blank#}2{#/blank#} (call) Lin Qiaozhi, a specialist {#blank#}3{#/blank#} women's diseases. She lived from 1901 to 1983. It seemed {#blank#}4{#/blank#} she had been very busy in her chosen career, {#blank#}5{#/blank#} (travel) abroad to study as well as writing books and {#blank#}6{#/blank#} (article). One of them {#blank#}7{#/blank#} (catch) my eye. It was a small book explaining how to cut the death rate from having and caring for babies. She gave some simple rules to follow for keeping babies clean, healthy and free from {#blank#}8{#/blank#} (sick). Why did she write that? Who were the women that Lin Qiaozhi thought needed this advice? I looked {#blank#}9{#/blank#} (careful) at the text and realized that it was intended for women in {#blank#}10{#/blank#} countryside. Perhaps if they had an emergency they could not reach a doctor.

    Lasa Bailey took her gloves off when {#blank#}1{#/blank#}(take)her dog for a long walk on a winter day and didn't notice anything until that evening. She was shocked when she realized her beautiful anniversary ring was missing. She {#blank#}2{#/blank#}(hurry)back to look for it but couldn't find anything. Her husband kept going on a website where people sell jewelry,{#blank#}3{#/blank#} never found it.

    All that changed, however, thanks to a recent Facebook post {#blank#}4{#/blank#}(write)on their local police department's page. A woman police officer posted, "If anybody knows of anybody losing a diamond ring, please contact us." One of her friends read it and wrote on it "Lisa Bailey".

    The police station happened to find some unidentified {#blank#}5{#/blank#}(jewel)in a local pawn shop (当铺) and took them away. When Bailey learned from her friend that her ring might {#blank#}6{#/blank#}(find), she couldn't believe it.

    The police called Bailey and asked her to describe it. She sent a picture of it to {#blank#}7{#/blank#} and then they asked if she could come to the police station. When the police officer in the station {#blank#}8{#/blank#} had written the Facebook post handed her the ring the next day  she was very thrilled and started to tear up. She could wear her anniversary ring home where it belongs {#blank#}9{#/blank#} (final) after three years' wait.

    Bailey's husband had offered to replace the ring after it went {#blank#}10{#/blank#} (miss), but she refused because she thought it wouldn't be the same.

    People came to the area that's now New Mexico more than 12,000 years ago. Experts think they migrated from {#blank#}1{#/blank#}is now Russia across a land bridge{#blank#}2{#/blank#}(call) the Bering Strait during the last Ice Age. Thousands of years{#blank#}3{#/blank#} (late), native American tribes including the Apache, Zuni, Navajo and Pueblos lived on the land.

    In 1540, a Spanish{#blank#}4{#/blank#}(explore), Francisco Vazquez de Coronado, came to the area in search of cities made of gold {#blank#}5{#/blank#}were rumored (谣传) to exist in the America. He didn't discover treasure, but over the next century the Spanish colonized the land. Then in 1821, Mexico declared its independence{#blank#}6{#/blank#}Spain, and the area became part of Mexico. But after the United States won the Mexican- American War in 1848, New Mexico became an American territory. In 1912, it{#blank#}7{#/blank#}(declare) the 47th state.

    When the Spanish set out to explore the region, they hoped to find land as{#blank#}8{#/blank#}(value)as what they had found earlier in Mexico. So they{#blank#}9{#/blank#}(name) the area Nueva Mexico. ("Nueva" means "new" in Spanish.) As for the word" Mexico", some experts think it's a version of a name that the Aztecs (a cultural group from Mexico) had for one of their gods.

    The state has beautiful scenery from{#blank#}10{#/blank#} (mountain) to forests and deserts. This earns it the nickname the Land of Enchantment.