下列物质中属于同系物的是（ ）
①CH3CH2Cl ②CH2="=CHCl " ③CH3CH2CH2Cl ④CH2ClCH2Cl ⑤CH3CH2CH2CH3 ⑥CH3CH(CH3)2
| A．①② | B．①④ | C．①③ | D．⑤⑥ |
相关试题
It’s high time you had your hair cut ; it’s getting _______ . 
| A．too much long | B．much too long |
C．long too much | D．too long much |
My friend showed me round the town, ______ was very kind of him. 
| A．which | B．that | C．where | D．it |
They use computers to keep the traffic _______ smoothly.
| A．being run | B．run | C．to run | D．running |
If you leave the club, you will not be_____back in .
| A．received | B．admitted | C．turned | D．moved |
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