【简答题】Effective communication between a dog and its owner is ________. A) essential to solving the dog’s behavior. problems B) the foundation for dogs to perform. tasks C) a good way to teach the dog new tr...
【单选题】Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect answer choices change the meaning in important ways or leave out essential i...
A.
Protoceratops had spines on its head that would evolve into the Ceratopsids's menacing horns.
B.
The small spikes on Protoceratops's head concealed the fact that they would grow into massive horns in maturity.
C.
The points on Protoceratops's head were almost nothing compared to the future Ceratopsids's great horns.
D.
There were some points on Protoceratops's skull, but they would someday rival the horns of the Ceratopsids.