Economic growth in China has led to extensive air and water pollution because of
A) the lack of government regulations addressing pollution.
B) inadequately enforced environmental protection policies.
C) the lack of concern from the general public.
D) difficulties connecting environmental pollution to disease.
Question 2
In using control by natural enemies of pests, from the ecological perspective it is best to
A) import enemies from abroad or from distant ecosystems to have the highest kill rate.
B) select enemies that have a very broad range of pest prey or hosts.
C) couple this method with intensive broad-spectrum pesticide spraying.
D) select enemies that are local and have a narrow specificity for the pest in question.
