2. 职称英语
  3. For most of human history, the dominant concerns about energy has centered【M1】__

For most of human history, the dominant concerns about energy has centered【M1】__

游客2023-10-14  69
问题 For most of human history, the dominant concerns about energy has centered【M1】________
on the benefit side.Inadequacy of energy resources of the technologies for harvested,【M2】________
converting, hence inconvenience, and constraints on its growth.The 1970’s, then,【M3】________
represented a turning excessive energy costs could pose threats on the par with those【M4】________
of insufficient supply.It also became upon possible to think that expanding some【M5】________
forms of energy supply could create costs exceeding the benefits.The crucial
question at beginning of the 1990’s is whether the trend that began in the 1970’s【M6】_________
will prove to be temporary or permanent.Is the eras of cheap energy really over, 【M7】_________
or will a combination of new resources, new technology and changing geopolitics
bring it back? One key determinant of the answer is the staggeringly scale of【M8】_________
energy demand brought forth by 100 years of population growth and industrial
demand.Except for the huge pool of oil underly the Middle East, the cheapest oil【M9】_________
and gas are already gone.Even if a few more giant oil fields are discovered, they will
make little difference against consumption on today’s scale.Oil and gas will have
to come increasingly, for most country, from deeper in the earth and from【M10】_________
imports whose reliability and affordability cannot be guaranteed. [br] 【M6】
选项
答案 at beginning中间加the
解析 该句的意思是“20世纪90年代初的关键问题是，始于70年代的这种趋势是暂时的还是永久性的”。at the beginning of…表示“在…开始”，为固定用法。因此需加上the。
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