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问答题

Listen again. Decide whether the following statements are true (T) or false (F).
Sunny days make us happy.
Low serotonin levels will make you feel tired and sad.
In hot weather we think fast and clearly.
The higher the temperature is, the happier we are.
We all work better on cold days.

单项选择题

第一学期，男女生各需完成健康跑的次数（）

A.25、20
B.30、25
C.35、30
D.40、35