Which of the following would be the most appropriate title for the passage？
A. The Proportion of Test-tube Girls to Boys
B. Are Test-tube Babies Healthy？
C. The Social Meaning of the Idea of Test-tube Babies
D. The Moral Issue Associated with Test-tube Babies
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SCN plays a role in daily rhythms.
A. Right
B. Wrong
C. Not mentioned
the identification of the internal clock may help to relieve human sleeping problems.
A. Right
B. Wrong
C. Not mentioned
Biological clock tells time.
A. Right
B. Wrong
C. Not mentioned
The placebo pills can ______.
A. ease pain
B. stop pain
C. cure a doctor
D. cure disease
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