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【简答题】
铬在水体中,受( )( )( )( )以及 ( ) 等条件的影响,三价铬和六价铬化合物在水体中可相互转化。铬是生物体所( )的微量元素之一。铬的毒性与其存在的状态有极大的关系。( )价铬具有强烈的毒性,它的毒性比三价铬高100倍。
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A new English Language examination testing four different skills.
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An examination testing Reading, Writing, Listening and Speaking.
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A new Business English examination having three certificates at three different levels.
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A new Business English examination testing certain business knowledge and skills.
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【单选题】听力原文： 'Where is the university?' is the question many visitors to Cambridge ask. But no one could point at any one direction because there is no campus. The university consists of 31 self-governing co...
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Because there are no signs to direct them.
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Because no tour guides are available.
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【单选题】听力原文： 'Where is the university?' is a question many visitors to Cambridge ask, but no one could point them in any one direction because there is no campus. The university consists of thirty - one self...
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Because there are no signs to direct them.
B.
Because no tour guides are available.
C.
Because all the buildings in the city look alike.
D.
Because the university is everywhere in the city.
【单选题】听力原文： 'Where is the university?' is the question many visitors to Cambridge ask. But no one could point at any direction because there is no campus. The university consists of 31 self-governing colleg...
A.
Because there are no signs of direction.
B.
Because it lies in a remote place.
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Because the university is everywhere in the city.
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Because there are no guides available.
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