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Many scientists have believed that there may be a _________of life on the Mar．

A．mark B．signal C．sigh D．sign

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Hey there,

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閱讀理解。
Directions: Read the following passage. Fill in the numbered blanks by using the information for the
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to GHGs through means such as emissions trading and/or a carbon tax .
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power-generation around technologies that produce energy and materials with little GHG emission and thus
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Title:   1
I.   2 : an economy with a minimal output of GHG
II.   3 of the present economy:
     ● global warming
     ● long-term climate change
     ●   4 on humanity
III.   5 :
     ● to produce energy and materials with little GHG emission
     ● to use those energies and materials efficiently
     ● to have   6 of GHGs
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      ● the strategies of carbon capture and storage
     ● renewable energy
     ●   8
     ● a carbon tax
V.   9 :
     ● spent-nuclear-fuel storage / storage of spent-nuclear-fuel
     ●   10
     ● uncertainty about the costs and time needed

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Shirley, a real book lover, often brings home many books to read _____ the library