防止血液凝固的方法是

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

    Here is a message that needs to ____(keep) in mind by every mom and dad. You love your kids not because of____they do, but because of who they are.

    In fact, raising a child is just like training a dog. You reward your children because of their

    ____ (succeed) or progress they made.____ (similar), a circus trainer gives a dog some food every time it ____(jump) through a hoop (圈).

The dog isn't loved for itself,____ for its actions.

    Dr. Laura Schlessinger, the popular talk show host, has a new book for children____ (title) Why Do You Love Me? Part of the story includes a mother ____ (explain) to her son that it is not what he does that makes her love him—she loves him because he is unique and he is ____ (she) son.

    Every mom, dad and grandparent needs to memorize the words of ____popular song: I love you most of all because you are you.

下图为某城市示意图，读图回答下列问题

我国人口的突出特点是（   ）。