Passage 2Questions 6 to 10 are based on the following passage. (77) Play is the principal business of childhood, and more and more in recent years research has shown the great importance of play in t
Passage 3Questions 11 to 15 are based on the following passage: If the Dakota Access Pipeline(输油管道) is completed, it will carry nearly half a million barrels of oil across four states every day. Ener