题目

To see the world is one thing；to have someone to share it with is another.Indeed，travel becomes more interesting when you have a travel partner.A travel partner can be a close friend，a family member，a pal you’ve met online，or a business friend. You can have someone to talk to Traveling alone is fun，but wouldn’t you feel lonely？Having a travel partner can remove the feeling of loneliness.This is especially true if you can get a travel companion who is very familiar with the place you’re traveling to.You don’t have to ask any information from the locals，and you 下列物质中，在核糖体上合成的是          ①雄性激素  ②抗体  ③淀粉  ④唾液淀粉酶  ⑤纤维素  ⑥胰岛素 A．①③④           B．②④⑥           C．②③⑤           D．①④⑥