题目

We all often deal with people who complain about the failures and troubles of their daily lives. Life   41   to be one big problem for them. I would like to think it   42   unusual. If there were no problems in your job, then your   43   would hire a much less capable(有能力的)person than you to do the things that don’t   44   much thought. In the business world, those who are able to solve difficult problems are the ones who are the most   45   to the employer. Many times the problems or challenges we face   46   us to grow and become more capable. The 关于万有引力定律，下列说法正确的是(　　)A. 万有引力的发现，揭示了自然界一种基本相互作用的规律B. 牛顿提出了万有引力定律，并测定了引力常量的数值C. 万有引力定律只适用于天体之间D. 地球绕太阳在椭圆轨道上运行，在近日点和远日点受到太阳的万有引力大小是相同的