Which of the following situations would be most likely to result in a uniform. dispersion
A. Birds compete for a place to build their nests．
B. Fish swim in large schools to avoid predators．
C. Whales develop strong bonds among relatives．
D. Elephants form. a circle to protect their young．
查看答案
The word range in paragraph 4 is closest in meaning to
A. territory
B. control
C. history
D. shelter
Which sentence below best expresses the essential information in the highlighted sentence
A. Numerous people had access to books and education because of the printing press．
B. It took several people to operate a printing press, so the number of skilled workers grew rapidly．
C. Previously forbidden books became available to people that could afford a private education．
D. The printing press made it possible for books to include more information than ever before．
The bias blind spot can prompt a scientist to______.
A. overemphazise the value of experiments
B. refuse to accept the failure of his experiments
C. discard some valuable data
D. disbelieve data collected by others
According to the passage, which factor might cause the population of a species to decrease
A favorable amount of light and water
B. An ability to hide from or defend against predators
C. A large number of other species competing for food
D. A greater number of births than deaths
微信支付 
支付宝支付