Why does the professor mention laundry detergent？
A. To give an example of price wars
B. To show that consumers buy different brands
C. To name an industry that introduces new brands
D. To explain the concept of brand loyalty
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Which of the following statements best summarizes the position of the revisionists？
A. The agricultural revolution affected all human activity.
B. The development of agriculture had a positive influence on nutrition.
C. Agriculture contributed to the health risks for early farmers.
D. Agricultural people had to move from place to place to plant crops.
A．studentsB．teachersC．deafD．Shirley
A. students
B. teachers
C. deaf
D. Shirley
Why does the professor mention artificial blood？
A. She is referring to the textbook.
B. She is answering a question.
C. She is reporting her research.
D. She is joking with the students.
A．attendB．describeC．searchD．find
A. attend
B. describe
C. search
D. find
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