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【单选题】
下列物质属于同系物的是（ ）A.
CH 3 CH 2 CH 2 OH与CH 3 CH 2 OCH 3
B.
与
C.
CH 3 COOH与HCOOCH 2 CH 3
D.
CH 3 CH 2 CH 2 CHO与(CH 3 ) 2 CHCH 2 CHO
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A.
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B.
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C.
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D.
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A.
join several student organizations
B.
have different classes with different students
C.
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A.
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B.
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C.
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D.
ámbito geográfico
E.
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