填入下面一段文字横线处填入语句,最恰当的一句是( )种群中较弱个体的存在,可能有助于加强种群的长期稳定性,从而减少灭绝的险。 ,结果发现,鱼群中混有多种不同的性状,会对种群产生积极的影响。那些在近海珊瑚礁区发育的幼鱼更可能返回成年时的栖息地;那些在潮池区发育的幼鱼可能成为繁殖的“赢家”,但它们通过增加数量和减少波动,为种群的稳定性做出了贡献。
Only when senior high schoolto show a greatinterest in poems.
Research has been limited to ____ production profits, rather than ____ that GM foods are safe.
(2012·重庆高考)—________ you interrupt now? Can’t you see I’m on the phone?—Sorry Sir, but it’s urgent.
One of my teachers ____ an Englishman.