The promise of finding long-term techn..-阿摩線上測驗
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3F Phoebe 高一下 (2017/05/22)
The promise of finding long-term technological solutions to the problem of world food shortages seems difficult to fulfill. ( A generalization is advanced) Many innovations that were once heavily supported and publicized, such as fish-protein concentrate and protein from algae grown on petroleum substrates, have since fallen by the wayside. (...supporting evidence is provided. ) |