等质量的下列各烃完全燃烧时，消耗氧气最多的是[ ]
A．C2H4
B．C2H6
C．C3H8
D．C6H6
答案：B
Will you _________ playing basketball?[ ]
A. join us in
B. join to
C. join us to
D. to join us
简述法律关系本座说。
