问题
单项选择题
在反证法中所使用的推理是充分条件假言直言推理的（）
A.肯定前件式
B.否定前件式
C.肯定后件式
D.否定后件式
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
在反证法中所使用的推理是充分条件假言直言推理的（）
A.肯定前件式
B.否定前件式
C.肯定后件式
D.否定后件式
参考答案：D
阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。 "A parcel arrived for you today," my father told me, as we were driving home from work．"It's quite big．" "Oh, really?" I wondered out loud．"Have you 36 anything? Maybe from Amazon or eBay or something…?" my father continued．"No, Dad．I'm 37 only one thing, but that should arrive in a（n） 38 ．" On Sunday, I will participate in a（n） 39 activity with some friends,' and．I had asked Bluebell if she could send me some of her homemade smile cards to 40 on the day．Since smile cards would have fit into an envelope,'! couldn't imagine what else could be in the 41 I became increasingly 42 as we continued to drive home．As soon as we arrived, I 43 to open the package．It had a neat, hand-written label （标签）on it．"There might be something easy to 44 inside," my father said, as he handed me some scissors．"Be careful when you open it．" The package was filled with all sorts of kindness 45 I First, some beautiful colorful posters with kindness ideas and 46 fell onto the floor．There were also loads of wrist bands （护腕）, which I will 47 at our kindness activity． 48 , there were three envelopes in the package——two of them had the most cleanly and neatly 49 smile cards, and the third had a wonderful card inside, which 50 , "Thank you very much for your kindness．．．loads of love, Bluebell．" "This is really 51 ," my father said  ．My mother and sister enjoyed the package as well．Bluebell put ．the biggest 52 on all of our faces! When I had asked her for some of her homemade smile cards to 53 some kindness during our activity, I never expected to 54 such a wonderful package filled with all sorts of kindness and inspiration!You have 55 made my day．Bluebell!
 ．poster B．parcel' C．envelope D．e-mail
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