What does it mean to be intelligent? Most psychologists agree that abstract reasoning, problem solving, and the ability to acquire knowledge are all【C1】______of intelligence. However, there is【C2】______agreement on other factors,【C3】______mental speed and creativity. Anyone who takes an intelligence test will be given an IQ score. This score allows【C4】______with people of the same age, on the【C5】______that 100 is the average IQ.【C6】______97% of people score【C7】______between 70 and 130. But what do IQ tests measure? To some【C8】______they measure our knowledge and vocabulary. But they also【C9】______on the size of working memory, speed of【C10】______, and an ability to choose appropriate strategies for solving particular problems. IQ tests were created almost 100 years ago and have generated【C11】______controversy since then. It has been found that IQ scores in America improved【C12】______20 to 30 points over the course of the 20th century. It does not make【C13】______to believe that this increase is due to big leaps in inherited intelligence from one generation to another. Instead, it seems likely that【C14】______generations have been better schooled in【C15】______it takes to do well on the tests. For many psychologists, it seems absurd to【C16】______the whole of human intelligence to the single score obtained on an IQ test【C17】______, they emphasize multiple intelligences. Someone who is skilled at learning languages may not be musically talented.【C18】______, our intelligence seems to vary according to how familiar we are【C19】______particular situations. One group of 10-year-old street vendors in Brazil, with very little schooling, were good at giving the right change, but did much worse when given【C20】______questions presented like school tasks. 【C1】