High in thick bamboo forests in the misty, {#blank#}1{#/blank#} (rain) mountains of southwestern China {#blank#}2{#/blank#} (live) one of the world's rarest mammals: the giant panda, also called the panda, Only about 1,000 of these black-and-white {#blank#}3{#/blank#} (relative) of bears survive in the wild.

    Pandas eat almost nothing {#blank#}4{#/blank#} bamboo shoots and leaves. {#blank#}5{#/blank#} (occasion) they eat other plants, fish, or small animals, but bamboo accounts for 99% of their diets.

    Pandas eat fast; they eat {#blank#}6{#/blank#} lot, and they spend about 12 hours a day {#blank#}7{#/blank#} (do) it. The reason is {#blank#}8{#/blank#} they digest only about a fifth of what they eat. Overall, bamboo is not very nutritious. To stay healthy, they have to eat a lot-up to 15 percent of their body weight in 12 hours-so they eat fast.

    Pandas' molars(臼齿) are very broad and flat. The shape of these teeth helps the animals crush the bamboo shoots, leaves, and stems they eat to get the bamboo to their mouths, {#blank#}9{#/blank#} hold the stems with their front claws, which have enlarged wrist bones that act as thumbs for grasping things. A panda should have at least two bamboo species where it lives, or it will starve. Pandas are shy; they don't go into areas {#blank#}10{#/blank#} people live. This restricts pandas to very limited areas.

    In many countries, {#blank#}1{#/blank#} is not unusual for families of different backgrounds to live together in the shared space. {#blank#}2{#/blank#}, in the United States, this idea may still be considered strange.

    But this type of housing, {#blank#}3{#/blank#} (call) co-housing, is getting its {#blank#}4{#/blank#} (popular) in the United States, too. Co-housing complexes (综合设施) appear across the country. For many people, this way of life is a good {#blank#}5{#/blank#} (choose) in the busy modern society. A co-housing community has {#blank#}6{#/blank#} (private) owned houses and shared land. There is often a “common house" with a kitchen and dining room, meeting room, and maybe a workshop of library or music room. About 25 co-housing communities {#blank#}7{#/blank#} (build) in recent years, and 150 more are planned.

    A co-housing complex is a place {#blank#}8{#/blank#} citizens shop, cook, and eat together. Citizens of a co-housing complex like its sense of shared community. Children have other kids to play {#blank#}9{#/blank#}, which many families like. Other citizens like the feeling of living in a “village”. Citizens also say that they can live in co-housing for {#blank#}10{#/blank#} (little) money than they would pay for nearby apartments.

    I'm not sure {#blank#}1{#/blank#} is more frightened, me or the female gorilla(大猩猩）that suddenly appears out of nowhere. I'm walking on a path in the forest in the Central African Republic. Unexpectedly, I'm face-to-face with the gorilla, who begins screaming at {#blank#}2{#/blank#} top of her lungs. That makes her baby scream, and then a 400-pound male appears. He screams the{#blank#}3{#/blank#}(loud)of all. The noise shakes the trees as the male beats his chest and charges toward me. I quickly lower myself, ducking my head to avoid {#blank#}4{#/blank#}(look) directly into his eyes so he doesn't feel{#blank#}5{#/blank#}(challenge).

    My name is Mireya Mayor. I'm a {#blank#}6{#/blank#}(science)who studies animals such as apes and monkeys. I was searching {#blank#}7{#/blank#} these three western lowland gorillas I'd been observing. No one had seen them for hours, and my colleagues and I were worried.

    When the gorillas and I frightened each other, I was just glad to find {#blank#}8{#/blank#}(they) alive. True to a gorilla's unaggressive nature, the huge animal {#blank#}9{#/blank#}(mean)me no real harm. He was just saying: "I'm king of this forest, and here is your reminder!" Once his message was delivered, he allowed me {#blank#}10{#/blank#} (stay)and watch.

You Are a Time Traveler

    Time travel has long fascinated people. Traveling to the past or future would allow you to live in exciting periods of history or get a glimpse(一瞥) of {#blank#}1{#/blank#} the future holds. Think about it. If you could travel in time, where would you go? Perhaps you would voyage far ahead of the present day {#blank#}2{#/blank#} (meet)your future self! What about watching an original performance of {#blank#}3{#/blank#} Shakespeare play in Elizabethan England? Or maybe you would pay a visit to {#blank#}4{#/blank#} (you)as a baby.

    Since these ideas are universally appealing to everyone, it is {#blank#}5{#/blank#} (nature)that time travel interests so many writers, filmmakers, and scientists. It has been depicted in a {#blank#}6{#/blank#} (various) of media, such as literature, film, and science reports. But you might be surprised to realize that {#blank#}7{#/blank#} the smallest sense of the term, we are all time travelers. Even as you sit here {#blank#}8{#/blank#} (read)this article, time is racing forward. The future becomes the past as soon as it happens. The present is so fleeting(稍纵即近)! Everything you do quickly {#blank#}9{#/blank#} (become) part of the past, and so it is that we move through time. The famous scientist Albert Einstein, assigned a mathematical formula to this idea, {#blank#}10{#/blank#} is called The Theory of Relativity.