Which of the following statements on the treatment of back pain is true？
A. Spinal fusion provides a better cure than other treatments.
B. Spinal fusion is no good to patients suffering from back pains.
C. There is limited evidence as to which treatment is better.
Doctors have great confidence in the benefits of spinal fusion.
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It is implied that doctors ______.
A. tend to choose the treatment that is considered the best for patients
B. have put financial interests ahead of patients in considerable cases
C. are likely to favor more complicated treatment to improve skills
D. wish to change the current system of how they get paid for their work
The IBM ads in the passage are used to ______.
A. show the popularity of the idea of busy bees
B. emphasize the negative image of busy bees
C. initiate public discussions on the busy bee image
D. question the comparison of busy bees to humans
The rat experiment is used to prove that chocolate ______.
A. is a typical comfort food
B. is no better than plain water
C. fits in the classic addiction theory
D. has nothing in common with drugs
Which of the following CANNOT explain our addiction to sugar and fat？
A. Sugar and fat stimulate our brain's pleasure center.
B. Sugar and fat cause our brain to think faster.
C. Sugar and fat lower our stress level and give us comfort.
D. Sugar and fat contain certain drug-like substances.
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