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【单选题】
科学家用催化剂将苯酚（X）和1,3-二羰基化合物（Y）合成一种重要的具有生物活性的结构单元——苯并呋喃（Z），W是中间产物（R 1 、R 2 均为烷烃基）。则下列有关叙述正确的是A.
反应①属于加成反应
B.
X、Y、W、Z都能使酸性高锰酸钾褪色
C.
X、Y、W、Z都能与NaOH溶液反应
D.
1 mol的X或W最多均能够消耗3 mol Br 2
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举一反三
【简答题】Without your help, I ______ (not, succeed) in catching that big fish.
【单选题】有关构成社区的基本要素描述，正确的是
A.
社区中人口的密度是构成社区的第一要素
B.
社区人口的性别比例是构成社区的第一要素
C.
一个社区的人口越多，越容易完成社区的目标
D.
人是社会生活的主体，是构成社区的第一要素
E.
社区中一定数量的人口彼此间相对独立没有联系
【单选题】concept
A.
join or combine
B.
idea; thought
C.
an instance of buying or selling something; a business deal
D.
succeed in catching or seizing
【单选题】In the author's opinion, the major cause of many people to make U-turns is that ______.
A.
they have eaten some drug which can change their identities.
B.
they become to consider the connections between different things.
C.
they want to succeed in catching some political opportunities.
D.
they have been stimulated by some big changes in their life experiences.
【单选题】Blind people meet with countless difficulties in their lives but, happily, they succeed in coping with many of them so they can live near-normal lives.
A.
catching up with
B.
dealing with
C.
keeping up with
D.
cooperating with
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