As mentioned in the passage, only one study found that roommates have an impact on the ______ of the other roommates.
A. academic grades
B. social behavior
C. sleeping patterns
D. personal attitudes
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In computer matchmaking, initially students do not reveal their ______.
A. personalities
B. identities
C. habits
D. hobbies
The author's attitude towards spinal fusion is probably ______.
A. supportive
B. undecided
C. critical
D. mixed
We can conclude from the passage that OnStar is ______.
A. too complicated to use especially for new drivers
B. not as useful and effective as the company claims
C. popularly used among more expensive ears
D. not widely used in the country except in a few states
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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