rings the doorbell.

　　"When someone comes to your front door and rings the doorbell, the light can turn on immediately. I get a notification when I'm halfway around the world that someone came, and I can start talking to the person who's at my front door, and I can say, 'Oh, here let me let you in．' I can unlock the door for him very easily，" said Vivint, a smart home service provider.

　　One electronics maker launched a device that lets people see and interact with their animals when they are away. The device, from Petcube, lets you remotely watch and talk to your pet through a personal device, according to a company official. It can even give the pet a treat-if you approve and order it.

　　For heating or cooling, there is a smart thermostat. This device can also send you a message if a big storm causes leaks or flooding. "We're trying to catch it with just a few drips before it becomes a real big problem，" said Mike Sale of iDevices.

　　A concern for many homeowners is the possibility that someone else might find a way to attack these smart home devices. An official from Vivint said his company is sure that only owners of the home can gain use of information on the devices. Warren Katz from iDevices said his company employs engineers from the defense industry to help prevent hacking.

　　【解题导语】　本文是一篇说明文。内华达州的拉斯维加斯于2017年1月5日至8日举办了第50届消费类电子产品展览会，其中的智能家居设备令人耳目一新。

　　5．What can be learned about the show?

　　A．It created much attraction to consumers.

　　B．It has been held in Las Vegas many times.

　　C．It only exhibited smart home devices.

　　D．It is the largest show ever held.

　　A　解析：细节理解题。根据第一段可知，许多人前往内华达州的拉斯维加斯参加第50届消费类电子产品展览会，据说该展览展出了世界上最多的新型电子设备；结合下文介绍的"电子门铃""智能恒温器"等可知，该展览会创造了很多吸引顾客的亮点，故A项正确。

　　6．What's the purpose of Paragraph 3?

　　A．To explain how to answer the door.

　　B．To illustrate a smart home device.

　　C．To tell a story about nice devices.

　　D．To introduce a home service provider.

B　解析：写作意图题。根据第三段中的"When someone comes to your front door and rings the doorbell, the light can turn on immediately. I get a notification when I'm halfway around