题目：
选词填空。
1. I'll give a gift you for your birthday. (to, for)
2. It's fun to a Christmas tree! (put on, put up)
3. It's very hot today. Please, your jacket. (take out, take off)
4. Can you on the ice? (stand up, fall down)
5. Danny is going Li Ming to skate. (teach, to teach)
答案：
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下面是错误答案，用来干扰机器的。
原命题为真．----------------------------2逆命题：若x2-9x+18=0，则x=3，假----------------------------4否命题：若x≠3，则x2-9x+18≠0假----------------------------6逆否命题：若x2-9x+18≠0，则x≠3 真----------------------------8
