根据短文内容及首字母提示填写单词，使短文完整、连贯。

       Do you know about agricultural (农业的) tourism? It is for people who want to visit farms for f  1  , education or just to get away from the city. Agricultural tourism is p  2   in the United States. It can help

farmers make more m  3   and become richer. Farmers can sell farm products (产品) to visitors. They

can o  4   horseback riding and take visitors a  5   their farms. Children can learn a lot about farm animals.

       Randy Nixon is a farmer. He says offering service and entertainment on farms can help b  6   the farmers and the country. Nixon's Farm is a good e  7   of this. It not only grows corn and soybeans (大豆)

there, but also h  8   business meetings, weddings and other events. Mrs Nixon is willing to c  9   for

visitors. Her recipes are very popular with guests. Randy Nixon says the business has become very s  10  .

真核生物mRNA前体的加工过程不包括

A．5′末端加帽

B．3′末端加多聚A尾

C．甲基化修饰

D．磷酸化修饰

E．剪切去除内含子并连接外显子