( )定律揭示了在广泛的范围内，差别感觉阈限与原刺激量的比值是一常数。
A．韦伯B．费希纳C．华生D．冯特
参考答案：A
—The poor people lived near the highway.
—_____ very noisy.
A．It must have been
B．They must be
C．That might be
D．There must be
金属镁的燃点大约是多少摄氏度？（）
A.1002到1006
B.685到688
C.38到40
D.28到38
—The poor people lived near the highway.