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【简答题】
抛物线顶点在，焦点在x轴上，且过点（8，8），焦点为F （1）求抛物线的焦点坐标和标准方程； （2）P是抛物线上一动点，M是PF的中点，求M的轨迹方程．
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【单选题】A third likely explanation for infantile amnesia involves incompatibilities between the ways in which infants encode information and the ways in which older children and adults retrieve it. Whether pe...
A.
What do you remember about your life before you were three? Other important occasions are school graduations and weddings. Few people can remember anything that happened to them in their early years. Adults' memories of the next few years also tend to be scanty. Most people remember only a few events—usually ones that were meaningful and distinctive, such as being hospitalized or a sibling's birth.
B.
What do you remember about your life before you were three? Few people can remember anything that happened to them in their early years. Other important occasions are school graduations and weddings. Adults' memories of the next few years also tend to be scanty. Most people remember only a few events—usually ones that were meaningful and distinctive, such as being hospitalized or a sibling's birth.
C.
What do you remember about your life before you were three? Few people can remember anything that happened to them in their early years. Adults' memories of the next few years also tend to be scanty. Other important occasions are school graduations and weddings. Most people remember only a few events—usually ones that were meaningful and distinctive, such as being hospitalized or a sibling's birth.
D.
What do you remember about your life before you were three? Few people can remember anything that happened to them in their early years. Adults' memories of the next few years also tend to be scanty. Most people remember only a few events—usually ones that were meaningful and distinctive, such as being hospitalized or a sibling's birth. Other important occasions are school graduations and weddings.