How is it possible to recognize an object when only part of it is visible？
A. The brain recognizes symmetry and visualizes the whole.
B. The object is often familiar enough to be recognized.
C. The pieces are large even though some are missing.
D. The principles for identification can be learned,
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Which of the sentences below best expresses the essential information in the highlighted sentence in the passage？ Incorrect choices change the meaning in important ways or leave out essential information.
At the time, the U.S. was struggling against many other nations to gain control of western lands.
B. The American government encouraged all people, regardless of their background, to settle in western regions.
C. Mexico, England, and the Native Americans all fought with America for the rights to the western territories.
D. U.S. authorities supported westward migration as it kept other peoples from taking over the land there.
According to Paragraph 3, how did Southern plantations cause people to move west？
A. By teaching them the skills they needed to start their own farms.
By promising to supply them with agricultural produce for their journey.
C. By building factories that destroyed people's farmland.
D. By severely limiting economic opportunities for small-scale farmers.
Why does the professor mention the coat of arms of Canada？
A. To compare the symbolism to that of a totem pole
B. To prove that the Haida live in Canada
C. To argue that the Haida symbols are superior
D. To place the events in chronological order
What are neurotransmitters？
A. Chemical imbalances
B. Chemicals in the brain
C. Images of the brain
D. Genetic triggers
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