【单选题】As the backbone of the North American continent, ______is known as the Continental Divide and separates the major river system of the United States.
【单选题】Which is NOT a difference between review paper and research paper?
A.
Research papers present results of experiment while review papers summarize results and ideas from other sources.
B.
Research papers often have standard structure while review papers often do no have standard headings
C.
Research papers use graphics or images to help present original data but review papers uses graphics to explain concepts rather than presenting experimental data or graphics.
D.
Research papers can be identified from their titles and abstract but review papers cannot be revealed from their titles and abstract.