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.

生物多样性的根本原因是（     ）

阅读下面古诗，完成下列小题。

更漏子·金雀钗

【唐】温庭筠

金雀钗，红粉面，花里暂时相见。

知我意，感君怜，此情须问天。

香作穗，蜡成泪，还似两人心意。

山枕腻，锦衾寒，觉来更漏残。