3 Listen to an advertisement. 听一则广告。
3-1 Look at the pictures of the smart devices in the advertisement you are going to listen to. Guess and choose what they can do. 看将要听到的广告中智能设备的图片，猜测并选择其功能。
(1)
A. Connect all the home devices together.
B. Turn off all the smart home devices.
(2)
A. Control the room temperature itself.
B. Make sure the home is safe.

3-1 (1) B (2) A

3-2 Listen and complete the following notes. 听广告，补全下列笔记。
Smart switches (开关) enable you to cut off power to unused (1) when you’re away from home. The technology brings you (2) , (3) , and low energy use.
The microwave radar sensor (微波雷达传感器) can (4) at home. The system can keep your home at a right temperature whether you are in or away. Therefore, the (5) of devices can last longer and the cost can be (6) .

3-2 (1) devices (2) convenience (3) power safety (4) sense your activity (5) service life (6) lower