单项选择题

Directions：
Read the following text．Choose the best word or phrase for each numbered blank and mark A，B，C or D on ANSWER SHEET 1．
Some people were just born to rebel；Charles Darwin was one of them． 21 Nicholas Copernicus，Benjamin Franklin and Bill Gates．They were 22 “laterborns”-that is，they had 23 one older sibling-brother or sister-when they were born．
24 ，laterborns are up to 15 times more likely than firstborns to 25 authority and break new 26 ，says Frank J．Sulloway，a researcher scholar at the Massachusetts Institute of Technology．
In his book“ Born To Rebel” being 27 this week，Sulloway claims that 28 someone is an older or younger sibling is the most important 29 shaping personality more significant than gender，race，nationality 30 class．
He spent 26 years 31 the lives-and birth orders-of 6，566 historical 32 to reach his conclusions．
A laterborn himself，Sulloway first 33 how birth order affected personality 34 a scholar of Darwin at Harvard University．
“How could a somewhat 35 student at Cambridge become the most 36 thinker in the 19th century？” He said．
Darwin，the first to 37 the belief that God created the world with his theory of evolution，was the fifth of six children．Most of his 38 were firstborns．
Sulloway’s theory held 39 with Copernicus，the first astronomer to 40 that the Sun was the center of the universe，and computer revolutionary Gates of Microsoft．