在Rt△ABC中，∠C=90 °，斜边c=5，两直角边的长a，b是关于x的一元二次方程x2﹣mx+2m﹣2=0的两个根，求Rt△ABC中较小锐角的正弦值
解：
Although he felt a little sleepy, ______ he had to kept ______ for another two hours. [ ]
A. /; driving
B./; to driving
C. but; to drive
D. but; driving
下列物质中不属于高能化合物的是
A．ADP
B．ATP
C．AMP
D．乙酰CoA
E．磷酸肌酸
