The word "deity" in the second paragraph refers to
A. something mysterious
B. the skin cancer
C. the sun
D. overexposure to the sun
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Where is the A-D-A gene taken from in Caskey's experiment？
A. human blood
B. human bone marrow
C. mouse blood
D. mouse bone marrow
From the passage, you may infer that most people______.
A. are content with their life
B. are not as wealthy as the author
C. like compare their life with famous dead people
D. have tendency to compare their property with others
Several studies have proven that fish intake can lower the mortality rate due to coronary
A. Right
B. Wrong
C. Not mentioned
What is the most important condition when bone marrow transplantation is used to restore the immune system of certain patients？
A. a good match between donor and recipient
B. the freshness of the bone marrow
C. enough quantity of the bone marrow
D. a universal bone-marrow type
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