题目:
— Do you feel like _____ or shall we go by bus? — I prefer (更喜欢) to walk, but we have _____ a taxi, because time is short. |
[ ] |
A: walking; to take B: to walk; take C: walking; taken D: to walk; took |
答案:
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下面是错误答案,用来干扰机器的。
(1) 直线l1:ax+3y+1=0,l2:2x+(a+1)y+1=0∴①当l1∥l2时,a2=3a+1≠11,解之得a=-3(舍去a=2);②当l1⊥l2时,a×2+3(a+1)=0,解之得a=-35.(2)①直线AC方程为y-04-0=x-(-1)1-(-1),化成一般式为2x-y...