It is a rainy (阴雨的) day. A train stops at a small ____. A man is on the train and he feels hungry (饥饿的). He looks out of the window (窗) and sees a shop. A woman is ____ cakes in the shop and the cakes look ____. The man wants to ____ a cake, but the shop is a little (有点) ____ from the train. The man doesn't want to walk in the rain. Then he sees a boy. The boy is about five ____ old. He's playing near the window. "Come here, boy!" says the man, "Do you know how ____ the cake is?" "One dollar for one." says the boy. The man gives the boy two dollars and asks him to buy ____ cakes. "One is for you and the ____ is for me," he says to the boy.

    After some time, the boy comes back. He's eating a cake. He ____ the man one dollar. "Sorry, there is only one cake left (剩余). I eat the cake and here is one dollar back," says the boy.

美国独立战争的转折点是____。

下列关于眼睛瞳孔的描述中，正确的是(    )

如图，四边形$OABC$是边长为1的正方形，$OD=3$，点$P$为$△BCD$内（含边界）的动点，设$\overrightarrow{OP}=\alpha \overrightarrow{OC}+\beta \overrightarrow{OD}\left(\alpha ,\beta \in R\right)$，则$\alpha +\beta$的最大值等于（    ）