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單項(xiàng)選擇題

Femle pnds usully hve one or two bbies .t times B．t onceC．tll timesD．t timFemle pnds usully hve one or two bbies .t times B．t once C．tll times D．t time

A．a(chǎn)t timesB．a(chǎn)t onceC．a(chǎn)t all timesD．a(chǎn)t a time

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單項(xiàng)選擇題

Which one of the following statements describes an advantage of killed-virus vaccines over attenuated live-virus vaccines？

A．Killed-virus vaccines induce a broader range of immune responses than do attenuated live-virus vaccinesB．Killed-virus vaccines more closely mimic natural infections than do attenuated live-virus vaccinesC．Killed-virus vaccines pose no risk that vaccine virus might be transmitted to susceptible contactsD．Killed-virus vaccines are efficacious against respiratory virus infections because they induce good mucosal immunityE．All above are correct

單項(xiàng)選擇題

Today, all babies usually get vaccines ___ the hepatitis B virus, but there is not yet a vaccination for hepatitis C.

A．a(chǎn)gainstB．a(chǎn)gainC．to