单选题 A number of personal characteristics play a vital role in the development of one"s intelligence. But people fail to realize the significance of cultivating these factors in young people. The "non-intelligence factors" include one"s feelings, will, motivation, interests and habits, etc. After a 30-year follow-up study of 8000 males, American psychologists【C1】______that the main cause of disparities in intelligence is not intelligence itself, but non-intelligence factors including the desire to learn, will-power and self-confidence. 【C2】______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 cultivating these factors. Some parents are greatly worried【C3】______their children fail to do well in their studies. They blame either genetic factors, malnutrition, or laziness, but they never take into consideration these non-intelligence factors. At the same time, some teachers don"t inquire into the reason why students do poorly. They simply give them more course and exercises, or【C4】______rebuke or ridicule them. After all, these students lose self-confidence. Some of them just feel defeated and【C5】______themselves up as hopeless. Others may go astray because they are sick of learning. An investigation of more than 1,000 middle students in Shanghai showed that 46.5 percent of them were【C6】______of learning, because of examination, 36.4 percent lacked persistence, initiative and conscientiousness and 10.3 percent were sick of learning. It is clear that the lack of cultivation of non-intelligence factors has been a main【C7】______to intelligence development in teenagers. It even causes an imbalance between physiological and【C8】______development among a few students. If we don"t start now to strengthen the cultivation of non-intelligence factors, it will not only obstruct the development of the【C9】______of teenagers, but also affect the quality of a whole generation. Some experts have put forward proposals about how to cultivate student"s non-intelligence factors. First, parents and teachers should【C10】______understand teenage psychology. On this basic, they can help them to pursue the objectives of learning, stimulating their interests and toughening their willpower.