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【单选题】
---Our train journey through Europe was __________. -We were __________ of sitting in our seats for so many hours.A.
tired, tiring
B.
tiring, tiring
C.
tired, tired
D.
tiring, tired
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举一反三
【简答题】桥梁的五大部件包括( )、( )、( )、( )、( )。
【单选题】Both emissions taxes and tradable emissions permits:
A.
are efficient cost-minimizing methods of pollution reduction.
B.
work only if they are coupled with environmental standards.
C.
encourage more pollution.
D.
are usually less effective than environmental standards.