在管腔中有瓣膜的血管是（    ）

博尔赫斯(1899—1986)是20 世纪____具有世界声誉的小说家和诗人，也是名震世界文坛的____的大师。被誉为 20 世纪最伟大的作家之一。

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                                                                                                        Mother’s Day

      Mums do a lot of hard work. They cook and clean for us—their children. They also encourage us and give us support. Mother’s Day is the time for us to say “Thank you “to our mums.

      In most countries, people celebrate Mother’s Day on the second Sunday in May every year. On this day, people like to buy flowers and make special Mother's Day cards for their mums.

     Mother's Day is not only about gifts. We can help our mums do the housework. We can take them to the park or the cinema. Sometimes a simple hug or saying “I love you, Mum” is the perfect gift for our mum.

     Mother's Day is about love. If you love your mum, why not plan a special Mother’s Day for her?