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【单选题】
下列四个命题:①经过定点P 0 (x 0 ,y 0 )的直线都可以用方程y-y 0 =k(x-x 0 )表示;②经过任意两个不同的点P 1 (x 1 ,y 1 )、P 2 (x 2 ,y 2 )的直线都可以用方程(x 2 -x 1 )(y-y 1 )=(y 2 -y 1 )(x-x 1 )表示;③不经过原点的直线都可以用方程+=1表示;④经过定点A(0,b)的直线都可以用方程y=kx+b表示.其中真命题的个数是(  )
A.
0
B.
1
C.
2
D.
3
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举一反三
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A.
正确
B.
错误
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A.
自律委员会
B.
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肾阳不足
B.
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中焦虚寒
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A.
Because she enjoys traveling by air.
B.
Because she thinks the journey is too long.
C.
Because the man likes it.
【简答题】A.She dislikes the man's wife. B.She enjoys spending money on cosmetics. C.She is married to a poor man. D.She is economical with her money.
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A.
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B.
She enjoys having something to do.
C.
She enjoys preparing dinner.
D.
She enjoys staring at the TV screen.
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