73.A) natural B) essential C) functional D) optional
第1题
Those who want more economic growth believe that continued economic growth ______.
A.is essential to the well-being of society as a whole
B.can provide the solution to many of our social problems today
C.can protect our environment from being polluted by industry
D.can provide us with more natural resources for industrialization
第5题
温度敏感突变的一种是冷敏感(Cs)突变,它在低于某特定温度下有突变表型,下表是几个必需基因的突变体(ess),“+”、“-”指形成菌落与不形成菌落。那么ess(Ts)、ess(Cs)双突变型的表型如何?
32℃ 37℃ 42℃
ess(Ts) + - -
ess(Cs) - - +