The idea of being able to walk on water has long interested humans greatly. Sadly, biological facts prevent us ever accomplishing such a thing without artificial aid—we simply weigh too much, and all our mass pushes down through our relatively small feet, resulting in a lot of pressure that makes us sink.

    However, several types of animals can walk on water. One of the most interesting is the common basilisk Basilicus basilicus, a lizard (蜥蜴)native to Central and South America. It can run across water for a distance of several meters, avoiding getting wet by rapidly hitting the water's surface with its feet. The lizard will take as many as 20 steps per second to keep moving forward. For humans to do this, we，d need huge feet that we could bring up to our ears in order to create adequate w hitting. ''

    But fortunately there is an alternative : cornflour. By adding enough of this common thickening agent to water (and it does take a lot), you can create a “non-Newtonian” liquid that doesn't behave like normal water. Now, if the surface of the water is hit hard enough, particles(粒子）in the water group together for a moment to make the surface hard. Move quickly enough and put enough force into each step, and you really can walk across the surface of an adequately thick Liquid of cornflour.

    Fun though all this may sound, it's still rather messy and better read about in theory than carried out in practice. If you must do it, then keep the water wings handy in case you start to sink--and take a shower afterward!

根据短文内容，选择最佳答案，并将选定答案的字母标号填在题前括号内。

    The faces of the four U. S. presidents on Mount Rushmore will likely last for centuries. But at a newly opened exhibit in Japan, you can catch them only for about eight months. This year, the annual sand sculpture event at the Sand Museum in Tottori, Japan, is focused on another country. This is the 10^th anniversary of the event. Artists came from 19 countries to shape sand into different sculptures that represent events in U. S. history and American landmarks.

    Tottori is a remote city in western Japan. In the past, not many tourists traveled to it. To attract more visitors, Tottori officials decided to use a natural resource: sand. They decided to create a sand museum that would house a series of sand sculptures based on different geographic areas of the world. The sand from each year's exhibition is used again the next year. The project has been a success. About 500,000 people visit the museum during the eight months. Some return year after year to see the new sculptures.

    The city is now a popular spot for sand sculpture artists too. Sculptors from around the world come to Tottori each spring, spending a few weeks working on their masterpieces. They use special tools to smooth the sandy surfaces, cut angles and details. They use only sand and water to create the huge sculptures, some of which tower over their creators.

    Originally, the artists built their creations outside. But the works lasted less than two months outdoors. So the museum built a permanent structure 10 house the artworks, which extended their life to eight months. Now many more tourists get to see the sculptures. Still, the fact that this art is not permanent is part of the appeal. The temporary sculptures reflect the Japanese value of appreciating the fleeting（稍纵即逝）nature of the world.

    Tottori is not the only Japanese town that shows temporary art like this. Sapporo, in northern Japan, hosts a similar exhibit in the winter, using snow instead of sand. Thai will be just about the time that the U. S. sand sculpture exhibition is taken apart, and the sand is saved for next year's show.

    Vinegar makes salad, fries and dumplings taste better, and you can even use it to clean your windows. And now, according to scientists, it may even the planet's population survive climate change.

    Researchers from the RIKEN Center for Sustainable Resource Science （CSRS） in Japan found that growing plants in vinegar makes them more resistant to droughts. This could mean that in the future, worries about climate change affecting the world's supply of food will be much lower. The discovery was made after the researchers studied the Arabidopsis, a plant known for its ability to survive in dry weather. It was found that when the plant was placed in drought﹣like conditions, it produced a chemical called acetate（醋酸盐）﹣the main component of vinegar.

    After discovering this, the scientists experimented further by adding acetate to the soil of other plants, before they stopped giving them water completely. After leaving the plants for 14days, they found that the ones treated with acetate had survived, while the untreated plants had dried up and died.

    It's hoped that this simple method of survival could soon be used to help farmers in dry countries keep their crops alive. "In the experiment, we targeted the staple foods of the world﹣rice, wheat and maize﹣and the basic plant of breeding species, rapeseed（油菜籽）," Jong Myong Kim, co﹣author of the study, told Popular Science magazine.

    Kim also told the magazine he's already been in touch with people all over the world who are interested in trying this simple and cost﹣effective method out for themselves from flower growing companies to amateur gardeners. Although at this point keeping thirsty plants alive isn't as easy as just pouring vinegar over them, Kim said he and his team are working on making the process as simple as possible. "Now we are trying to cooperate with some farmers, and also some companies, to make a method to apply this system, "he said. And for those of us who always forget to ask our neighbors to water our plants when we go away, hopefully this means the end of returning home from a trip to find our favorite flowers have died.

    Do you have the experience of digging out your suitcase, deciding what to bring and being afraid that you've forgotten something? {#blank#}1{#/blank#}. Hope they can transform the way you pack.

    Keep a Basket Handy

    Do you wait until the last minute to pack? Keep a basket in your bedroom, living room, or bath room that you can use to throw in items you'll need to pack as you come across them. {#blank#}2{#/blank#}. Besides, you can just put the contents of the basket into your suitcase if you are in a hurry to leave for the airport.

    Buy Wrinkle-free Clothing

    You won't need to worry about carefully packing your items of clothing if they're made from wrinkle-free materials. {#blank#}3{#/blank#}. You'll still look fresh and bright when you are in them at your destination.

Keep Old Packing Lists

    Chances are that you end up taking trips that require you to pack similar items. Keep old packing lists from former vacations to the beach, ski resort, and city—that way, you'll always have a list of at least the basics. {#blank#}4{#/blank#}. So you don't need to waste your effort to remember where you left your hand-written packing lists.

    Schedule a Packing Time

Time can slip away from you before a trip—you may be caught up at work, at home, or be occupied with other responsibilities of daily life. {#blank#}5{#/blank#}. That way, you will not need to do your packing crazily from the last minute to 1 o'clock on the day you leave.

A. This makes you less likely to forget the stuff.

B. The best way to do this is to save them on your computer.

C. Buy necessary stuff when you arrive.

D. Determine a night well in advance of departure to pack.

E. That's why I've distilled (提炼) the art of packing down to some essential tips.

F. Just ball them up or put them at the bottom of the suitcase.

G. Rolling your clothes is the best way to save space for the suitcase.

    Whether you're a child, teenager, young adult or are middle-aged, respect for your parents is an important value. Your parents are the people who raised you, devoting time, energy and money to your development. {#blank#}1{#/blank#} No matter your age is, there are 5 ways to show respect.

    Respect their belongings.

    One important way to show respect is to show regard for the things important to your parents. For younger children, this may mean not touching jewelry or other valuable things. For grown children, respect may mean returning a borrowed tool in good condition and on time. Lack of respect for a parent's belongings is a violation of personal boundaries. {#blank#}2{#/blank#}— And never borrow things without asking first.

    Punctuality.

    {#blank#}3{#/blank#} Therefore, always be on time. For teenagers, showing up on time means coming home by curfew (宵禁).Adult children should show up on time for family dinners or events, or to pick a parent up for a medical appointment. Call if you're going to be late because parents worry about children, no matter their age is.

    {#blank#}4{#/blank#}

    Remembering birthdays, anniversaries and other special days is a sign that you honor your parents. Make plans to take them to lunch or dinner or bake a cake or cookies. Most parents don't expect expensive gifts, but a handmade gift is always appreciated .A phone call from a grown child who lives too far for a visit is a welcome sign of respect.

    Be kind.

    Kind words and affection are simple ways to show respect. Tell your parents you love them. Listen and allow your parents to speak without interruption. Show a sincere interest in what your parents have to say. Be patient with your parents and don't rush them. Never talk back or be rude or disrespectful. Acknowledge your parents' achievements. {#blank#}5{#/blank#}

A. Celebrate with them.

B. Be a good listener.

C. Don't take advantage of your parents' kindness and generosity.

D. Treat your parents the way you would like to be treated.

E. Being respectful helps build positive relationships with others.

F. And they love you unconditionally throughout your life.

G. Lateness indicates a lack of respect.

A lunar crystal (水晶) was found in lunar basalt particles (玄武岩颗粒) collected from the moon in 2020 when the Chinese moon mission landed in Oceanus Procellarum, returning with more than 1.7 kg of lunar samples delivered safely to the Earth. 

The crystal found on the near side of the moon is giving scientists hope of providing limitless power for the world forever. It is made of material previously unknown to the scientific community and contains a key ingredient for the nuclear fusion (核聚变) process, a form of power generation that uses the same forces that fuel the sun and other stars. It is transparent and roughly the width of a single human hair, and it formed in a region of the moon where volcanoes were active around 1.2 billion years ago. 

One of the primary ingredients found in this crystal is helium-3 (氦-3) , which scientists believe may provide a stable fuel source for nuclear fusion reactors. The element is incredibly rare on the Earth, but it seems to be fairly common on the moon. China's next moon mission is expected to be carried out by Chang'e 6 in 2024, which will attempt to collect the first samples from the far side of the moon, which never faces the Earth. 

Although it is too early for scientists to have made financial estimates on such a fuel source, it will undoubtedly be extremely costly. There is, of course, the matter of bringing the crystals back from the moon, especially in large amounts that are needed to fuel fusion reactors. 

Helium-3 produces significantly less radiation and nuclear waste than other elements. The current nuclear fusion process has raised serious safety concerns, and as a result, scientists have been searching for a way to create nuclear power from nuclear fusion. During the fusion process, radioactive waste is not produced, potentially making a securer and more efficient fuel source. 

Around 25 tons of helium-3 could power the US for a year. Multiple private companies and countries with space agencies have signaled their intentions to mine the moon for helium-3, and this latest discovery could kick start the race.