【单选题】For what reason did the black walnut tree become popular during the colonial period?
A.
It was used for gun stocks.
B.
It was used by cabinetmakers.
C.
It was used as filtering material in gas masks.
D.
It provided shade during summer and nut for food.
【判断题】波函数 y 表明微观粒子运动的波动性,其数值可大于零也可小于零, 1⁄2 y 1⁄2 2 表示电子在原子核外空间出现的概率 ( 几率 ) 密度。
【简答题】For what reason did the narrator commit the murder?
【简答题】para 3 What reason did the parents have? What attitude did the children have?
【单选题】What reason did the old man give for needing money to get home?
A.
someone had stolen his money
B.
he had forgotten to bring his wallet with him
C.
the taxi fare was too expensive
【简答题】What reason did the man give for talking loudly during the movie?