下面关于种群的叙述正确的是( )①内蒙古草原上的全部牛是一个种群 ②池塘中所有的鱼是一个种群 ③稻田中所有的三化螟是一个种群 ④种群密度的决定因素是年龄组成、性别比例 ⑤种群密度的大小决定于出生率和死亡率、迁入率及迁出率
—Jenny, would you like to go hiking with me on Sunday or Saturday?
—_______ day is OK. I am free all this weekend anyway.
Dear students, please read every sentence carefully. _______ you are, _______ mistakes you’ll make.