It's April 12th today and it is my____(thirteen) birthday. I'm in USA, but my parents are in Shanghai. This is____(I) first birthday in the USA. I want to____a birthday party but don't know how to do it. My sister and her nice____have a birthday party for me. I am very happy to have it here, in the USA.____you, my sister, and thank you, my friends. Thank for your love.

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。

英国资产阶级革命中被送上断头台的国王是（    ）