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【简答题】
按照碳原子相互连接方式不同,烃分 和 两类,其中以碳碳单键相连的链烃叫 ,含有碳碳双键的链烃叫 烃,含有碳碳三键的链烃叫 烃。而分子中含有苯环的烃叫 烃。
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举一反三
【单选题】The last reason for their confidence in marriage is___________.
A.
They hardly took the time to know each other.
B.
They overlooked serious personality conflicts in the expectation that marriage was an automatic way to make everything work out right.
C.
Gail’s parents, after thirty-five years of marriage, were going through a bitter and painful divorce.
D.
They were sure to avoid the mistake made by many couples of marrying for the wrong reason.
【单选题】Their confidence in him was greatly _____ by his prolonged hesitation before taking any action.
A.
appreciated
B.
confirmed
C.
weakened
D.
cherished
【单选题】Their confidence in him was greatly ______ by his prolonged hesitation before taking any action.
A.
appreciated
B.
confirmed
C.
undermined
D.
cherished
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