题目内容：

    Scientists are not alone in the fight against the virus, as various products and apps are giving them a hand. Here are some examples.

Drones (无人机)

Drones have played a major role in disinfection (消毒). Police officers also use them to spread the latest information. What's more, they use drones to remind people to wear masks or warn them not to gather in large groups.

Robots

Robots are good helpers on the frontlines. They do many tasks in hospitals, including sending medicine or meals, doing disinfection and measuring patients' body temperature. This not only greatly reduces the burden for medical workers, but also prevents the cross-infection (交叉感染).

Mini-programmes

Different mini-programmes, or apps that you don't need to download but can use on Wechat, have also come to help. For example, you can check whether you have unknowingly travelled alongside infected patients. Community workers can collect information about people more easily with the help of mini-programmes.

Health QR codes (健康码)

People in more than 100 cities can get their own health QR codes by applying through Alipay or Wechat. This way, they don't have to fill in information like their names, ages and living addresses over and over again when they enter public places.

Title: 1. Joins the Fight

Drones	＞They play a major role in disinfection. ＞They are used by police officers to tell people 2. to do.
Robots	＞They help medical workers do much work. ＞They help reduce the 3. of cross-infection.
Mini-programmes	＞They are used to check if there are any infected patients near you. ＞They make it 4. for community workers to collect information.
Health QR codes	By applying health QR codes, people don't have to fill in their 5. information over and over again when entering public places.