The passage implies that which of the following is true of the petrochemical means of plastic production
A. New advances in petrochemical plant manufacture could potentially lessen the process' reliance on fossil fuel sources.
B. The fossil fuel resources incorporated in its products are less wasteful and environmentally damaging than the gas emissions produced by plant-based plastic production.
C. Petrochemical plant manufacture is generally more sustainable in environmental terms than plant-based plastic production.
D. Petrochemical plant manufacture generally depends on the most abundant fuel source available.
E. Petrochemical plant manufacture does not share in fuel sources in common with plant-based plastic production.
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女性，23岁，诊断为恶性贫血，可用于改善恶性贫血患者神经症状的药物是
A. {{*HTML*}}维生素B12
B. 叶酸
C. 右旋糖酐铁
D. 硫酸亚铁
E. 维生素C
HALCYON:
A. chronological
B. astounding
C. turbulent
D. sinister
E. ridiculous
OBSESSION:
A. revulsion
B. vexation
C. composure
D. dutiful attention
E. insolence
It can be inferred from the passage that which of the following was the prime goal in scientists' searching for organic means of producing plastic
A. the reduction of energy used in petrochemical plastic manufacture
B. the reduction of the production cost of petrochemical manufacture
C. the development of a biodegradable plastic
D. the creation of plastics with more useful qualities
E. the reduction of fossil fuel emissions in the environment
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