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【单选题】
You have an Exchange Server 2010 organization.Users report that they can share free/busy information with users at a federated partner， but they cannot share contacts with those users. You need to ensure that your users can share contacts with users at the federated partner. What should you modify？（）A.
the Federation Trust
B.
the EWS virtual directory
C.
the default sharing policy
D.
the Organizational Relationship
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【简答题】若函数 在 上可导， ，则 ______；
【简答题】已知a、b、m、n∈N + ，{a n }是首项为a，公差为b的等差数列；{b n }是首项为b，公比为a的等比数列，且满足a 1 ＜b 1 ＜a 2 ＜b 2 ＜a 3 ． （1）求a的值； （2）数列{1+a m }与数列{b n }的公共项，且公共项按原顺序排列后构成一个新数列{c n }，求{c n }的前n项之和S n ．
【单选题】It is getting diff icult to disconnect people from their work completely, because
A.
phones apps and constant connectivity connect people to work all the time
B.
it has become a way of life
C.
competition in the workplace is getting f ierce
D.
0
【简答题】如图所示的n×n的数表，满足每一行都是公差为d的等差数列，每一列都是公比为q的等比数列．已知a 11 =a，则a 11 +a 22 +…+a nn =______． . a 11 a 12 … a 1n a 21 a 22 … a 2n ? ? … ? ? ? … ? ? ? … ? a n1 a n2 … a nn . ．
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