All of the following are steps involved in true cloning EXCEPT ______.
A. selecting a stem cell
B. taking a developed cell
C. reactivating the genome within the developed cell
D. resetting the developmental instructions in the cell to its original state
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What is the author's attitude toward some recent figures mentioned in Paragraph 3？
A. Optimistic.
B. Skeptical.
C. Worrisome.
D. Critical.
The word "disparity" (Paragraph 2) may be replaced by ______.
A. difficulty
B. diversity
C. different
D. density
The second paragraph is mainly about ______.
A. the difficulties faced by young people in finding jobs
B. the gap between scientific and technical professionals and non-professionals
C. the difficult problems raised by rapid scientific advances
D. scientific research in the 21st century
The word "rejuvenated" (Paragraph 5) most probably means ______.
A. rescued
B. reactivated
C. recalled
D. regulated
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