某种群中RR、Rr、rr的基因型频率如下图，图中阴影部分表示繁殖成功率低的个体。则该种群下一代中三种基因型频率最可能是
A．
B．
C．
D．
答案：B
引起回归热的螺旋体是
A．钩端螺旋体B．伯氏疏螺旋体C．杜通疏螺旋体D．苍白密螺旋体E．品他密螺旋体
If being carried out successfully, the plan will completely change the traffic conditions in the city.
A．carried B．is carried C．having been carried D．to carry
