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共用题干 Face Masks May Not Protect from Su

免费题库2022-08-02  39
问题 共用题干Face Masks May Not Protect from Super-Flu
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 peo-ple should consider wearing them certain situations anyway,just in case.
But it's a question the public keeps asking while the government is making preparations for the next flu pandemic（大流行）.So the Centers for Disease Control and Prevention(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."
When that is not possible,the guidelines say you should 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 as 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.
Influenza pandemics can strike when the easy-to-mutate（变异）flu virus shifts to a strain（菌株）that people never have experienced.Scientists cannot predict when the next pandemic will ar- rive,although concern is rising that the Asian bird flu might trigger one if it starts spreading easily from person to person.
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（戴）an ill-fit-ting mask and hop on the subway instead.
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,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.
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.One of the concerns the CDC has is thatA: masks may give people a wrong assumption of being safeB: the sick may not wear masks and go outC: flu virus may spread via public transportationD: healthy people may not know how to protect themselves
选项 One of the concerns the CDC has is that
A: masks may give people a wrong assumption of being safe
B: the sick may not wear masks and go out
C: flu virus may spread via public transportation
D: healthy people may not know how to protect themselves
答案 A
解析 主旨大意题。文章第一段是主旨段落，质疑口罩在下一次世界范围的流感爆发时能够帮助人类。故本题选D。


根据第三段推断出，美国疾病控制和预防中心建议人们外出去人群中时带上口罩。选项A和D看似合理，但并没有提到口罩的使用，与文章的主题关系不大，排除。


根据文章第二段“The overall recommendation really is to avoid exposure.”可知，美国疾病控制和预防中心建议真正能为下一次流感大爆发做的准备是“avoid exposure"，而第三段中的that正是指美国疾病控制和预防中心的建议“avoid exposure"。


根据第四段“Scientists cannot predict when...if it starts spreading easily from person to person.”可知，如果亚洲的禽流感开始轻易地在人与人之间传播，就可能会引起一场大流行性疾病，虽然人们的忧虑不断升级，但科学家仍无法预测这样的大暴发什么时候会出现。因此选项A,B错误。根据第六段可知，流感爆发时，口罩并不能有效保护人们远离流感，故C项错误，D项正确。


根据第五段“Besides, the CDC is afraid masks may create a false sense of security.”可知，美国疾病控制和预防中心担心口罩可能会制造出一种虚假的安全感。
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