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【单选题】
在决定建设三峡工程之前,专家阿斯旺工程的经验教训进行过研究:阿斯旺大坝在获得灌溉、防洪、航运、发电等多方面效益的同时,也产生了一系列环境问题,主要是河口渔获量减少、下游农田因失去淤泥肥源而变得贫瘠、土地盐碱化、海水侵蚀加重等。读“阿斯旺工程与三峡工程对比图”, 下列关于两个工程利弊的叙述,正确的是( )A.
三峡工程的首要目标是为华北地区供水
B.
三峡工程对生态环境的有利影响主要在中下游
C.
阿斯旺工程的唯一目标是防洪
D.
阿斯旺工程对生态环境的不利影响主要在库区
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【单选题】In the past few years, My Heart Will Go On was a popular song among young people, _____were often heard singing it at parties．
A.
who
B.
which
C.
they
D.
that
【单选题】A few years ago, My Heart Will Go On was a popular song among young people, ______ were often heard singing it at parties.
A.
who
B.
which
C.
they
D.
that
【单选题】In the past few years, “My Heart Will Go On” was a popular song among young people, ____ were often heard singing it at parties.
A.
who
B.
where
C.
which
D.
what
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