[单项选择]The primary purpose of the passage is to
A. (A) expose the fragile nature of the foundations on which bioengineering research rests
B. (B) argue that bioengineering is ultimately infeasible as a means of manufacturing plastic
C. (C) argue that the advances in organically-based plastic manufacture cannot solve environmental issues
D. (D) explain the reasons for and objectives of current research on the development of organically-based plastic manufacture
E. (E) describe the nature of the organic plastic manufacturing process

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[单项选择]The primary purpose of the passage is to
A. (A) expose the fragile ecological conditions which modern irrigation technologies must ameliorate
B. (B) argue that new irrigation technologies would ultimately be less efficient than a reconfiguration of the North American diet
C. (C) argue that efficient water-use is dependent upon a mixture of various modern methods
D. (D) provide an overall view of possible methods for lessening the strain on sources of freshwater
E. (E) describe the cycle by which aquifers are depleted and then replenished through technology

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