某教研室教研员计划研究学生参与课堂讨论对其成绩的影响。他选择每周在某学校的语文课堂进行四个课时的跟堂观察。他依据含有具体观测维度的观察表，记录学生参与课堂讨论的具体情况。从研究类型上来看，这种观察属于（ ）。

(单选题)Picking a round shape of chocolate shows that a person _____ (单选题)This passage mainly tells us ______. (单选题)According to the writer, you can know more about “Walk to Sc (单选题)What is the first thing to do if you want to enjoy your walk (单选题)Which is NOT the benefit (好处) of walking to school? (单选题)By walking to and from school, children can learn ________. (单选题)Who are encouraged to take part in the programme of “Walk to (单选题)What would Bill probably say at last? (单选题)Three days before graduation, Bill asked Mark to talk becaus (单选题)At Bill’s home, they didn’t ______.