问题
单项选择题
有之必然，无之未必不然指的是（）命题
A、必要条件命题
B、充要条件命题
C、充分条件命题
D、负命题
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
有之必然，无之未必不然指的是（）命题
A、必要条件命题
B、充要条件命题
C、充分条件命题
D、负命题
参考答案：C
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| When Glen Kruger picked a small cat from an animal shelter, he did not expect much. Yet right from the start, eight years ago, there was an uncommon connection between him and the small black cat. He 1 her Inky. " I grew up on a hundred-acre farm and had only cats 2 playmatcs,"Kruger, The sevevty-year-old man,says. "My hearing was damaged by the 3 of farm epuipment , so I learned to connect with 4 . They react to what they see and what you do. " Inky was a gentle cat, 5 the house with five other cats. But on a January night in 2009, Inky did 6 that would set her apart from 7 cats forever. Kruger had gone down to the basemeng to 8 the wood stove for the night. When he was finished, he 9 to the top of the stairs and reached to turn off the lights. In doing so , he slipped and 10 his back against an old shelf. The heavy shelf came crashing down and sent Kruger down the stairs. 11 in a pool of blood on the basement floor, Kruger felt 12 going into shock(休克). He shouted for help, 13 his wife, Brenda , was asleep in their bedroom at the opposite end of the house. 14 Kruger noticed Inky watching from the top of the stairs. "Go get Brenda, " Krugger said to Inky. Inky 15 to the bedroom door and scratched 16 until Brenda opened it. Then Inky led her to the 17 Brenda found her husband 18 the stairs and called 911. Kruger was rushed to the hospital. "I spent six months 19 therd," Says kruger . "Although I became lame , I was blessed. " Sinec the acciedent, Inky has 20 Left Krhger's side.
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