下列说法正确的是（　　）

阅读短文，回答下面的问题。
    I'm John．My father's birthday is on January 5th．My mother's birthday is in January，too．My birthday is on April 4th．My brother's birthday is on November 2nd．Today is my sister's birthday．Her birthday is on October 3rd．It's her eleventh birthday．I buy a big cake for her．We have a birthday party in the evening．

下列加下划线字注音完全正确的一项是(   )

化石证明，有许多物种只存活了相当短暂的时代就逐渐灭绝了，最能解释这一现象的是（　　）

进入初中后，班主任老师在第一个班会上就说：“进入初中同学们要学会自主学习。”学会自主学习，就是要（    ）