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【简答题】
阅读下面问题： 1 1+ 2 = 1×( 2 -1) ( 2 +1)( 2 -1) = 2 -1 ； 1 3 + 2 = 3 - 2 ( 3 + 2 )( 3 - 2 ) = 3 - 2 ； 1 5 +2 = 5 -2 ( 5 +2)( 5 -2) = 5 -2 ． 试求：（1） 1 7 + 6 的值； （2） 1 3 2 + 17 的值； （3）试计算 1 1+ 2 + 1 2 + 3 + 1 3 + 4 +… 1 n + n+1 （n为正整数）的值．
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举一反三
【单选题】_____ are intermediaries who buy in large quantities from the producers and redistribute the goods to the middlemen at the next level retailers.
A.
Retailers
B.
Wholesalers
C.
Agents
D.
Brokers
【单选题】People are accustomed to think that a man in uniform______.
A.
suggests quality work
B.
discards his social identity
C.
appears to be more practical
D.
looks superior to a person in civilian clothes
【单选题】People are likely to think that a man in uniform. ______.
A.
suggests quality work
B.
shows his social position
C.
appears to be more practical
D.
looks more fresh and attractive
【单选题】Retailers who sell over the Internet are called
A.
cyber marketers.
B.
e-tailers.
C.
B2B commerce marketers.
D.
brick-and-mortar operations.
【单选题】关于单卵双胎的描述，正确的是
A.
所有单卵双胎有共同胎盘
B.
1/3单卵双胎容貌相似
C.
2/3单卵双胎有共同胎盘
D.
所有单卵双胎均没有共同胎盘
E.
1/3单卵双胎有共同胎盘
【单选题】People are accustomed to thinking that a man in uniform. ______.
A.
suggests quality work
B.
discards his social identity
C.
appears to be more practical
D.
looks superior to a person in civilian clothes
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