Each zebra has its own unique pattern of distinctive stripes (带), just {#blank#}1{#/blank#}humans have their own unique pattern of fingerprints, Zebras stick together in herds (兽群). Within a herd, zebras tend {#blank#}2{#/blank#} (stay) together in smaller family groups. Families are generally made up of a male, several females{#blank#}3{#/blank#}their young.

    As zebras graze, they use their sharper front teeth to bite the grass, and then use their duller back teeth to crush and grind. A zebra's teeth keep growing for{#blank#}4{#/blank#} (it) entire life, because constant chewing{#blank#}5{#/blank#}(wear) them down.

    Zebras are{#blank#}6{#/blank#} (constant) on the move to find fresh grass and water. Sometimes they gather in huge herds of thousands as they migrate to better feeding{#blank#}7{#/blank#} (area). They often travel in{#blank#}8{#/blank#} (mix) herds with other grazers and browsers, such as wildebeest.

    Zebras groom (理毛) one another, If you see two zebras standing close{#blank#}9{#/blank#} each other and it looks like they're biting each other, don't worry. They're pulling loose hairs off each other as they groom. Grooming also feels good to a zebra—it's like having an itch scratched,

    While most zebras are least endangered, Grevy's Zebra{#blank#}10{#/blank#} (classify) as endangered.

    The Amber Room, an{#blank#}1{#/blank#} (amaze) treasure, which was decorated with gold and jewels, was made of several tons of{#blank#}2{#/blank#} (select) amber. It first{#blank#}3{#/blank#} (belong) to the King of Prussia and was given to Peter the Great as a gift. The Czar sent Frederick William a troop of his best soldiers{#blank#}4{#/blank#} return. Later it was moved to a palace outside St Petersburg{#blank#}5{#/blank#} Catherine Π spent her summers.

    During the Second World War, when Germany and Russia were at war, The Nazis stole the room{#blank#}6{#/blank#} (secret). In less than two days 100,000peices were put into twenty-seven{#blank#}7{#/blank#}(wood) boxes and put on a train for Künisberg. After that, what happened to the Amber Room{#blank#}8{#/blank#} (remain) a mystery and the room is now missing. Recently, the Russians and Germans have built a new Amber Room,{#blank#}9{#/blank#} looks like the old one,{#blank#}10{#/blank#} (celebrate) the 300^th birthday of the city of St Petersburg.

The English word "dinner" used to refer to breakfast. It comes from the Old French word "disnar", {#blank#}1{#/blank#} in fact means "breakfast".

So {#blank#}2{#/blank#} did this word come to have a different meaning? {#blank#}3{#/blank#} (tradition), dinner (what we now refer to as breakfast) was the first meal of the day, eaten around noon. It also happened to be the {#blank#}4{#/blank#} (big) meal of the day, with a lighter meal coming later {#blank#}5{#/blank#} (know) as supper.

Today many people find {#blank#}6{#/blank#} strange that the biggest meal of the day once centered around noon, {#blank#}7{#/blank#} it made great sense at that time. Artificial lighting such as oil lamps and candles were expensive, and provided weak light at best. So people went to sleep at sundown, because it's difficult {#blank#}8{#/blank#} (work) and eat in the dark. The last meal of the day was a rushed affair, a quick snack before the lights went out.

Eventually, more meals {#blank#}9{#/blank#} (add) to the day. This meant that people were eating smaller meals before the bigger meal. So the word that once {#blank#}10{#/blank#} (refer) to our first meal, now refers to our last. However, it is true that in many Western cultures dinner still remains the biggest meal of the day.