专题限时集训(二十二)语法填空(Ⅱ)A(2020·葫芦岛市质检)Sincethebeginningof2020,COVID191
hascaught(catch)theworld'sattention,andhere'ssomethingyouneedtoknowaboutit
Coronavirusesareacommoncauseofcoldsandupperrespiratory(呼吸的)infectionsinhumansandcertainother2
mammals(mammal)andbirds
Themicrobescan3
easily(easy)spreadfromoneanimaltoanother
Everynowandagain,ananimalcoronavirusmutates(突变)toinfecthumans,4
leading(lead)tocontagiousrespiratoryinfectionsthathaveneverbeenmetbefore
Thismakes5
itharderforphysicianstodiagnose(诊断)andcure,andresultsinoutbreaks
ThesymptomsofCOVID196
are(be)similartothoseexperiencedwhenpeoplesufferfromtheflu
Theyincludefever,cough,tiredness,musclepain7
andshortnessofbreath
Somevictimshavealsoexperiencedsevereheadachesanddiarrhea
Coronavirusestypicallypassthroughdroplets
Therefore,scientistsrecomm