Experts seem to agree: If you are not a health care worker, do not buy N95 masks, long considered the best of protective masks. They will not help you much, and they are _______1________ for the people who need them most: health care workers trying to protect themselves from COVID-19 __2__ saving lives. However, there is still ___3__ over whether everyone should wear some kind of face covering when they leave their homes. _____4_______ and _______5_______groups of people remain the best ways to stop the spread of the new coronavirus. But some experts suggest that some kind of face covering may help, too -- not by protecting the wearer from infection, but by protecting others from the wearer. There is _____6______ that people can spread the disease without having signs of sickness themselves. The new coronavirus, which causes COVID-19, spreads mostly through small drops of liquid that infected people expel from their mouths. That happens when they ___7_ or __8_. But it can also happen when they talk or sing. If virus-infected drops of liquid land on surfaces, people who touch the surface get the drops on their hands. From the hands, it is a short trip to the eyes, nose or mouth. Masks may help by ___9___ at least some of those droplets. N95 masks generally are best for preventing someone from _____10_____. When used correctly, they fit closely onto the face and block more particles than most other masks. However, many people do not use them correctly. They often do not get a __11__ enough fit, which largely __12___ the purpose of the masks. Surgical masks ( 医用外科口罩)are another popular choice. They may help prevent the wearer from infecting others. But again, the masks should be saved for health care workers. Some cloth masks （布口罩）may also help protect the public too. But it is not clear how much protection different kinds of fabric provide. A homemade mask should only be considered as a last___13__ to prevent droplet transmission from infected individuals. But it would be better than no protection." Andrus, the global health professor, is worried that masks will give wearers a ____14_____(假象) of security. Wearing a mask of any kind is no __15__(替代） for social distancing, he said. But, "This is a war," he added. "Anything we can do to ____16____ risk （使风险最小化）is critically important." 完成听力题后，到讨论区完成翻译题。/module/audioplay.html?objectid=edc7d9f23ce3c62013b25a675943efe7