【C10】A．empowersB．reinforcesC．supportsD．sustains

To determine that a compartment contains sufficient oxygen to sustain life, you should use

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【C10】A．buildB．destroyC．conserveD．sustain

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These seats are ____ for special guests.A.preservedB.reservedC.retainedD.sustained

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How should we understand the social benefits of a sustainable transportation system？A．It s

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【C10】A．retainingB．containingC．obtainingD．sustaining

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56._________A. strategies B. reasonsC. supportsD.

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The aim of sustainable development is________.A.t

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