Knowledge is power．But there is one other thing that we must

Knowledge is power．But there is one other thing that we must remember．A strong mind needs a str
strong body in order to make it most useful．
There are a great many good exercises．They are helpful and healthful．Many of them may be taken indoors during rainy weather．Indoor exercises,however,are never as helpful as those taken out of doors in pure,fresh air．It is because in fresh air more oxygen is taken into our systems and more wastes are given off．The air in the house doesn't remain fresh very long．But out of doors it is usually fresh and pureBut what shall we play?There are a number of games such as football,basketball,race…．Any game with a lot of movement is good．The best ones are played out of doors．
Do not neglect your body．It is as much important as your mind．Our country now needs men with strong minds,good judgement ,and strong bodies．
31．The writer thinks that ____．
A．a strong body can make a strong mind most useful
B．a strong body is more useful than a strong mind
C．a strong mind can make a strong body most useful
D．a strong mind is more useful than a strong body
32．The indoor exercises are not as helpful as those taken out of doors because ____．
A．the air in the house isn't fresh
B．during rainy weather the air in the house doesn't remain fresh long
C．the air in the house cannot be always fresh
D．we cannot make the air in the house fresh
33．Which one of the following is right?
A．Out of doors the air is always fresh．
B．The games with a lot of movement are not better than those with no movement．
C．You can do nothing if you have strong mind only．
D．Your mind has the same importance as your body．
34．The word“systems”in this passage talks about _____．
A．gamesB．ideas C．some parts in human bodies D．ways or exercises