在前瞻性调查中，确定人群分组方法是（）。

A.按发病者与未发病者分

B.按年龄，性别，职业，生活条件相同而发病情况不同分组

C.按不同家族史分组

D.按暴露于某因素和未暴露于某因素分组

E.按随机方法

请根据句意及首字母提示，写出所缺单词。

小题1: He often s________ for some useful information on the Internet.

小题2: When I was young, I was very a________ of snake.

小题3:We all know that the Moon moves around the E________.

小题4: I want to see English films to improve(提高) my English, but they speak too q________ for me to catch their meaning.

小题5:How s________ the cat is! It has only three legs.