菊花，是经过长期的人工选择培育出来的一种观赏花卉，在我国有三千多年的栽培历史。根据花序大小和形状的不同，菊花可分为单瓣、重瓣，扁形、球形等；根据花期的迟早，可分为早菊花、秋菊花、晚菊花等；根据花径的大小，可分为大菊、中菊、小菊；根据瓣型不同，又可分为平瓣、管瓣、匙瓣三类十多个类型。千姿百态的花朵、姹紫嫣红的色彩使菊花具有了独特的观赏价值。不仅如此，有些菊花还可食用，可冲饮，可入药，有良好的保健功能。在百花凋零的秋冬季节，菊花傲霜怒放，被视为高雅不屈的象征，成为历代文人艺术创作的重要题材。

    Each zebra has its own unique pattern of distinctive stripes (带), just ____humans have their own unique pattern of fingerprints, Zebras stick together in herds (兽群). Within a herd, zebras tend ____ (stay) together in smaller family groups. Families are generally made up of a male, several females____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____ (it) entire life, because constant chewing____(wear) them down.

    Zebras are____ (constant) on the move to find fresh grass and water. Sometimes they gather in huge herds of thousands as they migrate to better feeding____ (area). They often travel in____ (mix) herds with other grazers and browsers, such as wildebeest.

    Zebras groom (理毛) one another, If you see two zebras standing close____ 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____ (classify) as endangered.

买15kg大米花了x元，每千克大米售价为15÷x元．