单项选择题
碳碳双键键能与碳碳单键键能的关系是： A.
双键键能等于单键键能的2倍 B.
双键键能等于单键键能 C.
双键键能大于单键键能 D.
双键键能小于单键键能
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Which of the following is not done by Bo Le to train the horses?
A．He brands them with a hot iron, trims their manes, cuts their hoofs, and puts halters on their heads
B．He ties up the horses with the halter on their heads and ropes on their legs, makes them stand up in a row in the stable
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