[单选题]（ ）包括关键词检索、高级检索和检索结果三种方式。
A.信息检索
B.综合检索
C.专题检索
D.网站检索

投资的目的是获得收益，但收益是未来的，而且一般情况下难以事先确定，未来收益的不确定性就是投资风险。如何扩大收益，规避风险？怎样才能掌握投资技巧，在为社会创造财富的同时，又成功地在财富世界筑起自己理想的王国，使我们的生活更加丰富多彩，充满诗情画意？
某研究小组以“投资的收益与风险”为课题，开展研究性学习。
假如你是该小组成员，请回答下列问题：

You’re standing in the kitchen and a voice says, "Add a little more salt to that soup." Yes, it’s always nice to have someone help you when you’re cooking. But this voice is not from a man. You are alone! Then where does it come from Is it from a ghost No, this isn’t a ghost kitchen -- it’s the kitchen of the future.
Scientists are working to improve everything in the kitchen, from fridges to tables, and even the way we cook. They are making a system. It will help a person cook a meal. You do not need cookbooks. You can hear how to cook food.
The fridge of the smart kitchen has a scanner. It looks at the foods in the fridge. It will order more milk from the store when your milk has gone bad or there is no more in the fridge. The gloves will test the temperature of everything they touch and say, "Need to cook longer" or "Hot and ready to eat". If you leave them on the stove by mistake, you’ll hear th
A. can help you do everything
B. can clean the {ridge when it is dirty
C. can give you a warning when there is something wrong
D. can talk with you