【判断题】猪的性成熟随品种类型、饲养水平和气候环境不同而异。
【单选题】F2自交收获的种子及其种植后长出来的植株叫( )。
【单选题】A beaver builds a dam because ______.
A.
it imitates human behavior
B.
it tries to find a better way of living
C.
dam-building is relevant to its evolved needs and goals
D.
a dam helps a beaver to go beyond its evolutionarily determined circumstances
【判断题】烈性传染病患者车站可以不予运送,已购车票按旅客退票的有关规定处理。(部竞赛题)
【判断题】烈性传染病患者车站可以不予运送,已购车票按旅客退票的有关规定处理。