共用题干 1.If a super-flu strikes,face masks may not protect you.Whether widespr...

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问题共用题干 1.If a super-flu strikes,face masks may not protect you.Whether widespread use of masks will help,or harm,during the next worldwide flu outbreak is a question that researchers are studying furiously.No results have come from their mask research yet.However,the government says peoph should consider wearing them in certain situations anyway, just in case.
2.But it's a question the public keeps asking while the government are making preparations for the next flu pandemic.So the Centers for Disease Control and Preventions(CDC)came up with preliminary guidelines."We don't want people wearing them everywhere,"said the CDC."The overall recommendation really is to avoid exposure."
3.When that's not possible,the guidelines say to consider wearing a simple surgical mask if you are in one of the three following situations.First,you're healthy and can't avoid going to a crowded place.Second,you're sick and think you may have close contact with the healthy,such a, a family member checking on you.Third,you live with someone who's sick and thus might be in the early stages of infection,but still need to go out.
4.Influenza pandemics can strike when the easy-to-mutate flu virus shifts to a strain that people never have experienced.Scientists cannot predict when the next pandemic will arrive,although concern is rising that the Asian bird flu might trigger one if it starts spreading easily from person to person.
5.During the flu pandemic,you should protect yourself. Avoid crowds,and avoid close contact with the sick unless you must care for someone.Why aren't masks added to this self protection list?Because they can help trap virus-laden droplets flying through the air with a cough or sneeze. Simple surgical masks only filter the larger droplets.Besides,the CDC is afraid masks may create a false sense of security.Perhaps someone who should have stayed home would don an ill fitting mask and hop on the subway instead.
6.Nor does flu only spread through the air. Say someone covers a sneeze with his or her hand, then touches a doorknob or subway pole.If you touch that spot next and then put germy hands on your nose or mouth,you've been exposed.It's harder to rub your nose while wearing a mask and so your face may get pretty sweaty under masks.You reach under to wipe that sweat,and may transfer germs caught on the outside of the mask straight to the nose.These are the problems face masks may create for their users.
7.Whether people should or should not use face masks still remains a question.The general public has to wait patiently for the results of the mask research scientists are still doing.

选项 Paragraph 2________. A:Reasons for excluding masks from the self-protection list. B:Effort to stop flu from spreading. C:When to use face masks. D:Guidelines on mask use. E:Warnings from the CDC. F:Danger of infection through germy hands and masks.

答案 D

解析文章第二段主要讲的是为了消除公众的疑惑，政府公布了口罩的使用指南。因此选项D是正确的。
文章第三段主要列举了三种必须使用口罩的情况。因此选项C是正确的。
文章第五段主要解释的是不把口罩放入自我保护的名单里的原因。因此选项A是正确的。
文章第六段通过举例解释携带病菌的手和口罩会给人带来的影响。因此选项F是正确的。
文章第一段提到“······全球流感疫情中广泛使用口罩到底是有益或是有害，是研究人员正在研究的一个问题”，因此选项E是最合适的。
文章第三段和第五段提到CDC并不建议人们走到任何地方都戴口罩，实际上口罩会让人们产生一种虚假的安全感。因此选项A是正确的。
文章提到研究人员仍然在就口罩进行进一步研究，结果还未出来。因此人们在研究结果出来之前是不会知道答案的，只有选项F是正确的。
在剩下的选项中仅有B项在逻辑关系和语义上符合题意，该句意思是“文章暗示我们美国当局在认真处理口罩问题”。

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共用题干 1.If a super-flu strikes,face masks may not protect you.Whether widespr...

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