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【单选题】
结构 的烷烃,其系统命名是( )A.
3，3-二甲基丁烷
B.
2，2-二甲基丁烷
C.
3-甲基丁烷
D.
2-甲基丁烷
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举一反三
【单选题】I’ve already ___ at the hotel.Can I put my luggage in your room for a while?
A.
checked out
B.
checked off
C.
paid off
D.
paid off
【判断题】Don’t put the hotel’s address and phone number on your luggage tags in order to avoid identity theft.
A.
正确
B.
错误
【简答题】You could put your big luggage in the Left Luggage.
【简答题】When you arrive at the airport for your flight, you go to the ______ ______ first. 2. When your departing flight is announced, pick up your ________ ______ and go to the gate. 3. Before you get on the...
【单选题】I’ve already ___ at the hotel.Can I put my luggage in your room for a while?
A.
checked out
B.
checked off .
C.
paid for
D.
paid off
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