We use “{#blank#}1{#/blank#}” body language when we are introduced to strangers, Like other animals, we are on {#blank#}2{#/blank#} until we know it is safe to relax.

    At Wushan we made a {#blank#}3{#/blank#} up the Daning River to see some of the smaller gorges.

    The Chinese flag was {#blank#}4{#/blank#} in the wind. On a {#blank#}5{#/blank#} mountain was a sign in20-foot {#blank#}6{#/blank#}.

    The director of a {#blank#}7{#/blank#} tourist office, Meng Fanying, said the monster, which seemed black in colour, was ten metres from the edge of the lake during the most recent {#blank#}8{#/blank#}.

    They also think that there might be {#blank#}9{#/blank#} creatures in other lakes around the world. Scientists, however, are {#blank#}10{#/blank#}.

    Jane Scott is fourteen years old and last year she {#blank#}1{#/blank#} (begin) to study in a middle school. She likes {#blank#}2{#/blank#} (dance) and singing and spends a lot of time on them. But she hates math and {#blank#}3{#/blank#} (not study) hard at it. She thinks it difficult to learn math. Once she failed the math exam, and now she decides to give it up. Her father is angry with her when he knows about it.

    It was Sunday. Mr. Scott gave a call to his sister. She teaches math in another school. He hoped she {#blank#}4{#/blank#} (come) and tell his daughter how {#blank#}5{#/blank#} (learn) math. The woman came quickly and said, “You're a clever girl, Jane. I'm sure you'll soon do well in math if you work hard at it. ”

    “I'm afraid I can't, Aunt,” said Jane. “I am not interested in math at all.”

    “I don't think so.” said the woman. “You {#blank#}6{#/blank#} (be) good at it if you try your best. You {#blank#}7{#/blank#} (do) more exercises and practice a math problem again until you make it. Well, here's a math problem. Think it over and practice it again and again, then you {#blank#}8{#/blank#} (work) it out. ”

    “OK,” said the girl, “Let me {#blank#}9{#/blank#} (have) a try.”

    About an hour later Jane took the exercise book to her aunt and said, “I {#blank#}10{#/blank#} (do) the problem ten times by now.”

    “Well done!” her aunt said happily, “What answers did you get?!”

    “Ten answers.”

    How long can a person live?How tall can a human being grow?The Guinness（吉尼斯）World Records book lists many of the greatest records{#blank#}1{#/blank#}the greatest potentials（潜能）.But it's a fossil record.It speaks only to what has been done,not how much can{#blank#}2{#/blank#}(do),which is why it has to be constantly updated（更新）.

    Take the{#blank#}3{#/blank#}(surprise )case of the British middle-distance runner Roger Bannister for example.In the 1950s, experts said{#blank#}4{#/blank#}the human body could not run a mile in less than four minutes.Then Bannister came along in 1954 and proved it could{#blank#}5{#/blank#}act be run in 3:59.4.Once Bannister broke the imaginary barrier{#blank#}6{#/blank#}(sudden )the floodgates opened;scores of runners started besting（击败）the four-minute mark every year,each one{#blank#}7{#/blank#}(fast) than the last. How fast does a human have the ability{#blank#}8{#/blank#}(run)the mile today?We honestly don't know.That is why we hold our{#blank#}9{#/blank#}(breathe )during every Olympics.

    All we know{#blank#}10{#/blank#}(be)that this kind of change is possible.Keep this in mind the next time you feel stuck or challenged.Just because it hasn't been done before doesn't mean it's impossible.

    With so much information available in books and online, it's easy {#blank#}1{#/blank#} (learn) a few new facts each day. But how much of that do you {#blank#}2{#/blank#} (actual) remember? {#blank#}3{#/blank#}your answer is not much, here is the good news. Scientists at RMIT University in Melbourne, Australia, recently designed a new typeface (字体) {#blank#}4{#/blank#} was invented with read-it-and-forget-it people {#blank#}5{#/blank#} mind. Very appropriately, it's called Sans Forgetica.

    The idea behind Sans Forgetica is simple. The typeface is a tiny bit {#blank#}6{#/blank#} (difficulty) to read, which {#blank#}7{#/blank#} (mean) your brain has to work twice as hard to understand what it says. Because of that deeper focus, you'll have a better memory for whatever you're reading. That's not just a theory, either. The typeface was created by a team of {#blank#}8{#/blank#} (researcher) from RMIT University's School of Design and its Behavioural Business Lab. The group worked with a famous typographer Stephen Banham to test and improve {#blank#}9{#/blank#} (they) product.

    The typeface uses principles of cognitive psychology to create an effect {#blank#}10{#/blank#} (know) as desirable difficulty, the researchers note, which causes the brain to take part in deeper cognitive processing. The result is improved memory.

    Every year, butterfly(蝴蝶) lovers in California go out in November to count monarch butterflies. They {#blank#}1{#/blank#}(get) a worrying result from their fall monarch count in 2018—{#blank#}2{#/blank#} number of monarchs had dropped by 86% since 2017.

The orange and black monarch butterflies are famous {#blank#}3{#/blank#} their long migrations(迁徙)—they fly thousands of miles every year. In the spring and summer they fly north; in the fall they fly south again.

    Monarchs, like most butterflies, are {#blank#}4{#/blank#}(terrible) important for plants. They help create more plants by spreading pollen(花粉) between plants. In turn, monarchs depend on plants for food. And they depend completely on a plant called milkweed {#blank#}5{#/blank#}(lay) their eggs.

    But monarchs have been facing growing problems for years. As more and more wild land has been turned into large farms, the monarchs have had trouble {#blank#}6{#/blank#}(find) enough milkweed. Many farms also use chemicals {#blank#}7{#/blank#} will kill insects in order to protect their plants. These chemicals also affect monarchs. Besides, pollution has made milkweed less {#blank#}8{#/blank#}(health) for the monarchs than it used to be.

    Scientists say monarchs will be in danger of dying out in the next 20 years if nothing {#blank#}9{#/blank#}(do) to save them.

   {#blank#}10{#/blank#}(thing) that people can do to help include planting milkweed, controlling the use of chemicals, protecting wild areas, and planting trees.