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【单选题】
以下四个命题中，正确命题的个数是( ) ①坐标平面上的所有直线都有倾斜角 ②坐标平面上的所有直线都有斜率 ③若直线的斜率存在，则必有倾斜角与之对应 ④若直线的倾斜角存在，则必有斜率与之对应A.
0
B.
1
C.
2
D.
3
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A.
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B.
a car of the same brand
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a car that was well-liked
D.
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A.
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C.
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D.
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A.
Not all the companies, big or small, provide Internet connections.
B.
All the companies, big or small, try to improve Internet connections.
C.
Only large companies provide Internet connections to the desktop.
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Internet connections are expanding rapidly especially in small companies.
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