In this section, you will hear three news reports. At the end of each news report, you will hear two or three questions. Both the news report and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D).A、It was held in Las Vegas.
B、It had a large collection of modern computers.
C、Vivint is a smart home service provider.
D、It was said to be the largest collection of new electronic devices in the States.