题目

The sharing economy, represented by companies like Airbnb or Uber, is the latest fashion craze. But many supporters have overlooked the reality that this new business model is largely based on escaping regulations and breaking the law. Airbnb is an internet-based service that allows people to rent out spare rooms to strangers for short stays. Uber is an internet taxi service that allows thousands of people to answer ride requests with their own cars. There are hundreds of other such services.     The good thing about the sharing economy is that it promotes the use of underused resou下列运算中，正确的是（ ）A．x3•x3=x6B．3x2+2x3=5x5C．（x2）3=x5D．（x+y2）2=x2+y4