填空题

Antibiotics have been proved not effective in preventing against viruses.

【参考答案】

Y
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单项选择题
A．He’s not sure he wants to go to the party.B．He may not be able to give the woman a ride.C．He just returned from a visit to the Andersons.D．He will give the woman a ride if he was also invited to the party.
A．He’s not sure he wants to go to the party.
B．He may not be able to give the woman a ride.
C．He just returned from a visit to the Andersons.
D．He will give the woman a ride if he was also invited to the party.
填空题
Epidemic diseases can be prevented by means of vaccination or ______.
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