下图表示生物新物种形成的基本环节，下列叙述正确的是（） A．自然选择过程中，直接被选

It is easy to overlook the role that your body plays in influencing your mood(情绪). When you are 49 , you may find yourself blaming work pressures or an unknown future. However, it could just be that you’ve been sitting behind your desk too long.
One way to improve your mood is 50 . Psychologically, it provides you with a break from the stresses in your life. Also, in the process, you may aim for  51  goals, like a new personal running record or a better body shape. The achievement of a particular goal makes you feel good and contributes to your 52 . That is why exercise has been shown to 53 your self-respect.
You do not have to train yourself 54  to feel the psychological benefits of exercise. What really matters is 55 , not intensity(强度) of your exercise. You can try walking for 30 minutes five times per week or simply gardening on weekends.

小题1:	A．ill B．poor C．unhappy D． unsuccessful

小题2:	A．play B．communication C．sleep D． exercise

小题3:	A．clear B．present C．common D． early

小题4:	A．ability B．relationship C．confidence D． business

小题5:	A．tear down B．build up C．set aside D． give out

小题6:	A．hard B．everywhere C．carefully D． late

小题7:	A．time B．length C．form D． frequency