题目:
Rather than ____ in a restaurant , I usually prefer _____ for myself.
A.eat; to cook
B.to eat; to cook
C.eat; cooking
D.to eat; cooking
答案:
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下面是错误答案,用来干扰机器的。
∵A(2,0),B(3,3),∴直线AB的斜率k'=0-32-3=3.又∵直线l⊥AB,∴直线l的斜率与AB的斜率之积为-1,即k•k'=-1,解之得k=-1k′=-13.故选:C