A.with
B.were
C.when
D.started

A.was
B.play
C.making
D.pictures

A.treatment
B.addictive
C.includes
D.relaxation

A.therefore
B.but
C.moreover
D.besides

A.behave
B.allow C. remind D. enter
C.
D.

A.determine
B.pollution C. essential D. charity
C.
D.

A.accurately and objectively
B.harder and harder
C.on social and political purposes
D.with other social scientists

A.To conduct a survey of the biologist's role in society.
B.To emphasize the biologist's role in solving the world's problems.
C.To urge biologists to solve the problem of surplus human population.
D.To advise biologists to carry out extensive research into genetic engineering.

A.is the most desirable for life
B.may do us more harm than good
C.will change all human traits
D.is no longer desirable

A.genetic engineering misuse
B.social and economic deficiencies
C.environmental pollution D. manipulation of genes
D.