Agriculture must, therefore, ______ workers and savings to the new industrialized, urbanized sectors if a modern economy is to be achieved.
A. yield
B. succumb
C. subject
D. resort
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病毒的致病因素:()
A. 内毒素
B. 外毒素
C. 荚膜
D. 以上都不是
Some people () in part the defeat of the revolution in France and Germany to the English diplomacy, do you agree
A. contributed
B. attributed
C. distributed
D. owned
The middle-aged woman has been ()_ with a serious illness for half a year; she is dying now.
A. laid down
B. laid off
C. laid up
D. laid in
病原体感染机体后,未引起明显症状和病理损伤,病原体还存在于体内,这种现象是:()
A. 隐性感染
B. 显性感染
C. 病原携带状态
D. 潜伏性感染