下列行为属于先天性行为的是（　　）

某化学实验小组实验结束时，将含有CuSO₄、ZnSO₄、FeSO₄的废液倒在废液缸里，为回收有关金属和盐，同学们设计了如图的实验方案：

试回答：

如图为某区域一月份等温线图，三条等温线的气温关系是a＞b＞c，据图判断下列说法正确的是（　　）

用适当的介词填空

①His mother's birthday is ____  August 24th.

② Mother's Day is ____ May every year.

③—When were you born?

   —____ 1981.

④We have a birthday party ____ Saturday.

⑤ May is the fifth month ____ a year.

⑥Spring Festival is usually ____ January or February.

⑦Let's meet ____ 4:00 in the afternoon.

⑧You need to have a rest ____ noon.

⑨Women's Day is ____ March 8th.

⑩Please phone me ____ the evening.