阅读下面一篇文章，掌握其大意，然后从各题所给的四个选项A、B、C、D中，选出最佳选项，并在答题卡上将该选项涂黑。
Some personal characteristics play an important role in the development of one’s intelligence . But people fail to realize the importance of training these factors in young people .
The so-called ‘non-intelligence factors’（非智力因素）include 1 feelings , will , motivation （动机）, interests and habits . After a 30-year follow-up study of 8000 males , American psychologists （心理学） 2 that the main cause of disparities in intelligence is not intelligence 3 , but non-intelligence factors including the desire to learn , will power and self-confidence .
4 people all know that one should have definite objectives , a strong will and good learning habits , quite a number of teachers and parents don’t pay much attention to 5 these factors .
Some parents are greatly worried 6 their children fail to do well in their studies . They blame either genetic （遗传的）factors , malnutrition ,（营养不良）or laziness , but they never take 7 consideration these non-intelligence factors . At the same time , some teachers don’t inquire into these , as reasons 8 students do poorly . They simply give them more courses and exercises , or 9 criticize or laugh at them .
