The main task now facing ecologists, environmental activists and conservationists is ______.
A.to prevent pollution by legislation, economic incentives and persuasion
B.to arouse public awareness of the importance of environmental protection
C.to take radical measures to control environmental pollution
D.to improve the quality of life by enforcing environmental standards
第6题
成人最常见的“左向右分流”先天性心脏病是
A.房间隔缺损
B.室间隔缺损
C.房间隔缺损加室间隔缺损
D.动脉导管未闭
E.法洛四联症
第7题
成人最常见的“左向右分流”先天性心脏病是
A.房间隔缺损
B.室间隔缺损
C.房间隔缺损加室间隔缺损
D.动脉导管未闭
E.法洛四联症
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