函数f(x)=e^x+x-2的零点所在的区间为（   ）

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若数列$\left\{a_n\right\}$满足规律：$a_1>a_2<a_3>...<a_{2n-1}>a_{2n}<...$，则称数列$\left\{a_n\right\}$为余弦数列，现将1,2,3,4,5排列成一个余弦数列的排法种数为(    )

(A)

    Li Hong is a middle school student. She is a Young Pioneer. Liu Ying is in her class. She is a Young Pioneer, too. They go to school at seven every day. They don't go by bus. They have most of their classes in the morning. On Tuesday afternoon, they have two hours of sports. School is over at four in the afternoon. They do their homework at home. Sometimes they like to play football or watch TV after school.

    On Saturday afternoon they go to an old woman's house. She is about seventy. The two girls clean her room and carry water for her. They also buy things for her. They give the old woman a lot of help.