下列化合物分子中一定既含单键又含双键的是 [ ]
A．C6H6
B．C2H6O
C．COCl2
D．H2O2
答案：C
Every weekend my younger brother will go to help the old man far away my house,for which he often received some from the old man,such as a pencil and some sugar.
A．awards
B．honors
C．helps
D．rewards
（）葡萄酒——包括在正餐后饮用的烈酒和与甜食一起饮用的甜酒。
