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【简答题】
当决定糖构型的手性碳参与 成 环时,在标准哈沃斯( Haworth)式中,异头碳羟基与末端羟甲基是反式的为 异头物 ,顺式的为 异头物 。
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举一反三
【单选题】Listen to six people ask questions about food and drink in a restaurant . Choose the itme that each person is talking about.
A.
the check
B.
the menu
【简答题】Listen to six people . What drinks do they ask for?
【单选题】Listen to six people ask questions about food and drink in a restaurant . Choose the itme that each person is talking about.
A.
cake
B.
coffee
【单选题】Listen to six people ask questions about food and drink in a restaurant . Choose the itme that each person is talking about.
A.
coffee
B.
the meat
【单选题】温总理说，我讲一个故事，你可以告诉台湾同胞。在元朝有一位画家叫黄公望，他画了一幅著名的《富春山居图》，79岁完成，完成之后不久就去世了。几百年来，这幅画辗转流失，但现在我知道，一半放在杭州博物馆，一半放在台北故宫博物院，我希望两幅画什么时候能合成一幅画。画是如此，人何以堪。温总理之所以所拿《富春山居图》之类的文化典籍来比喻两岸关系，这是基于（）①文化典籍是中华文化一脉相传的重要见证②挖掘和保护传统...
A.
①②④
B.
①④
C.
①③
D.
②③④
【单选题】Only after the students have mastered the rules of pronunciation _____.
A.
can they memorize words more easily
B.
when can they memorize words more easily
C.
then they can memorize words more easily
D.
when they can memorize words more easily
【单选题】Listen to six people ask questions about food and drink in a restaurant . Choose the itme that each person is talking about.
A.
soup
B.
pasta
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