His report from the flooded area described a(n) ___________ of desolation.
A. scene
B. array
C. manifestation
D. prospect
To secure the smoothness of the traffic, the transportation is constantly ___________ by computers.
A. monitored
B. intrigued
C. safeguarded
D. nurtured
非传染源包括
A. 急性传染病患者
B. 潜伏期感染者
C. 已知携带病原者
D. 未知携带病原者
E. 健康人群
艾滋病病毒的特点是
A. 耐高温
B. 不耐高温
C. 在唾液中的浓度高
D. 在体外容易生存
E. 只在血液和精液中