All the lights _____ and we were _____ i_爱下问搜题

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问题选择题

All the lights _____ and we were _____ in the dark. [ ]

A. turned off; keeping

B. went out; left

C. went out; keeping

D. turned out; left

答案

答案：B

解答题

已知c＞0，设命题p：指数函数y=-（2c-1）^x在实数集R上为增函数，命题q：不等式x+（x-2c）²＞1在R上恒成立．若命题p或q是真命题，p且q是假命题，求c的取值范围．

单项选择题

在渤海面上背真风而立，高压在（）

A.右后

B.左后

C.右前

D.左前