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炔烃不但可以加一分子卤素，而且可以加两分子卤素，但却比烯烃加卤素困难，反应速率也小，为什么？

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与亲电试剂 Br2、Cl2、HCl 的加成反应，烯烃比炔烃活泼。然而当炔烃用这些试剂处理时，反应却很容易停止在烯烃阶段，生成卤代烯烃，需要更强烈的条件才能进行第二步加成。这是否相互矛盾，为什么？

The ice cream cone, the hamburger, and the iced tea were all introduced at the 1904 Louisiana Purchase Exposition, _____ known as the St. Louis Fair.

A. accidentally
B. unofficially
C. incorrectly
D. occasionally

Farmers have always had a particular interest in the weather, because it _____ their work.

A. accelerates
B. effects
C. affects
D. exerts

I was _____ to learn that you are going to spend the summer with your parents in Hong Kong.

A. disgraced
B. distracted
C. thrilled
D. attracted