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【单选题】
以中心的旅游区是( )。A.
拉萨旅游区
B.
藏戏旅游区
C.
藏西南旅游区
D.
藏南旅游区
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【简答题】结核菌素试验阴性反应有何意义？
【单选题】Victor couldn't speak because he ______.
A.
didn't want to speak
B.
didn't learn to speak
C.
couldn't hear anything
【简答题】已知函数 ，其中 a为 常数． （1）当 时，求 的最大值； （2）若 在区间（0，e］上的最大值为 ，求 a 的值； （3）当 时，试推断方程 = 是否有实数解．
【单选题】— I saw Tony at the party. But he didn't speak to me _____ evening. — Maybe he didn't see you. [ ]
A.
all
B.
every
C.
either
D.
another
【单选题】She _____ an old friend of hers yesterday while she was shopping at the department store. [ ]
A.
turned down
B.
dealt with
C.
took after
D.
came across
【单选题】He didn't speak slowly and he didn't speak clearly _______.
A.
neither
B.
either
C.
too
D.
nor
【简答题】函数 f(x)=lnx+ x 2 2 在区间[1，e]上的最大值是______．
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