It is stated in Paragraph 2 that Pell grants
A. cover the majority of the college costs.
B. are intended to help impoverished students.
C. have maintained their value from 1986 to 2005.
D. keep pace with the rise of living costs.
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By referring to current genetic findings of Perls, the author intends to
A. support the idea that extremely longevity are ascribed to genes.
B. show some genes are associated with lower rates of certain diseases.
C. support the idea that common genes are related to extremely longevity.
D. discuss the relationship between genes and certain diseases.
Perls may most likely agree that
A. most extremely long-lived benefit from not smoking.
B. environmental factors play an important role in longevity.
C. longevity is only associated with certain genetic profiles.
D. intellectually active has nothing to do with living an old age.
By analysing the genes of centenarians, scientists found that
A. environment and lifestyle. contribute much to longevity.
B. centenarians" genes are the same as other people.
C. many genetic variants may identify centenarians.
D. 19 genetic profiles of centenarians are different from others.
本讲提到，实施乡村振兴战略，要巩固和完善农村基本经营制度，使承包地的确权登记颁证延长40年。()
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