四、回答问题
KEY→P37
范畴:人与自我 主题:健康生活 体裁:说明文 难度:★★★ 建议用时:7分钟 评价:/5
Computers, phones, headphones(耳机)... We use many tech devices every day. Sometimes, we put them on the dining table or on our beds. But that is a bad idea because they can be very dirty.

Scientists in the USA did a study. They tested 38 tech devices and found headphones to be the dirtiest. Some have over 3,000 bacterial(细菌的) groups on them. That makes them seven times dirtier than a normal toilet seat. It has around 425 groups.
Phones are cleaner. They have about 187 bacterial groups on them. But we touch phones a lot, so we can easily catch bad bacteria from them. These bacteria can make our eyes, ears and skin sick.
We should clean our tech devices often after we use them. It is also important to keep them away from the dining table and wash our hands before eating.
How to clean the tech devices:
- Unplug(拔掉……的插头) the device, and use soapy water to wipe it with a soft cloth.
- For a computer keyboard, turn it upside down and shake it.
- For a phone, take off the cover and brush away any dirt.
根据短文内容,回答下列问题。每题答案不超过6个词。
1. What is the dirtiest tech device according to the study?

2. How many bacterial groups are there on phones?

3. What can bad bacteria from phones cause?

4. What should we use to wipe tech devices?

5. What else can we do to keep tech devices clean?

回答问题
本文指出日常使用的科技设备如耳机、手机等很脏，上面的细菌可能危害健康，并介绍了清洁这些设备的方法，同时强调要让设备远离餐桌，做到饭前洗手。
1. Headphones. 根据文中"They tested 38 tech devices and found headphones to be the dirtiest."可知，最脏的科技设备是耳机。
2. About 187. 根据文中"Phones are cleaner. They have about 187 bacterial groups on them."可知，手机上大约有187 个细菌群。
3. Eye, ear and skin problems. 根据文中"But we touch phones a lot, so we can easily catch bad bacteria from them. These bacteria can make our eyes, ears and skin sick."可知，手机上的有害细菌会导致眼睛、耳朵和皮肤问题。
4. Soapy water and a soft cloth. 根据文中"Unplug the device, and use soapy water to wipe it with a soft cloth."可知，我们应该用肥皂水和一块软布擦拭科技设备。
5. Put covers on mobile phones.(言之有理即可)