下列有关生物体内遗传物质的叙述，正确的是 (　　)

读下面一段短文，用括号内所给单词的适当形式填空。
American summers are filled with outdoor picnics, baseball games and swimming pools. Summer in America is a time____ (enjoy) the outdoors, no matter how hot it might be. Let's take a look at some of the popular drinks.
Lemonade is ____  (common)of all American summer drinks. It____ (make)by mixing lemon juice, water and sugar. It is usually served very cold, with ice. Ice tea is another  popular summer drink in America. Ice tea is usually served in a tall glass of ice. Many Americans____  (choose) to add sugar to sweeten the drink. This drink is often drunk in the afternoon while relaxing in the shade. Ice tea is now also sold by the bottle , at almost any store in America.  
The Slurpee, a famous American drink in recent years, is a great way to cool off in the summer heat. It is a mix of ice, sugar and fruit juices. However, the drink is mostly made of ice. They can ____  (buy) at most small convenient stores. Slurpees are popular with young Americans. Milkshakes have a long history in America . It is made of a mix of ice cream , milk and flavoring.

朱德同志有诗云：锦绣山河收拾好，万民尽做主人翁。这里的“民”是指（    ）

    Li Daming and his friend Wang Lingling____from Beijing．Li Daming is____and Wang Lingling is thirteen．Wang Hui is Wang Lingling's friend．He is____Shanghai and his English name is Henry．Tony Smith is____．He is thirteen  ____old．

仿照画横线语句的样式，在后面写一个与前句意思连贯的分句。
生活是一杯酒，散发着迷人的醇香；生活是一本书，蕴涵着深刻的哲理；生活是________________                       _______________。