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.

A.the development of new ideas
B.his basic research
C.his manipulation of genes D. the consequences of his discoveries
D.

A.serious environmental pollution
B.activities of an overpopulated society's industry
C.activities of surplus human population
D.the waste products dumped into our environment

A.The workers at the factory shouldn’t wear protective clothing.
B.The workers at the factory must wear protective clothing.
C.The workers at the factory needn’t wear protective clothing.
D.The workers at the factory may wear protective clothing.

A.Soil pollution is reported to have posed a serious threat to the livelihood of many local farmers.
B.It has been reported that soil pollution has actually put many local farmers' lives at risk.
C.It is reported that the livelihood of many local farmers has led to serious soil pollution.
D.The livelihood of many local farmers was reported to be seriously endangered by soil pollution.

A.The doctor suggested that I do exercise and eat more vegetables.
B.The doctor told me to do exercise and eat more vegetables.
C.The doctor had me to do exercise and eat more vegetables.
D.The doctor reminded me to do exercise and eat more vegetables.

A.heat
B.sweat C. seat D. meat
C.
D.

A.provoked
B.achieved C. defined D. emerged
C.
D.

A.beneficial
B.costly
C.valuable
D.worthy