编制时间数列的最基本原则是保证数列中各项指标必须具有（）
A.可加性
B.可比性
C.连续性
D.一致性
参考答案：B
老年心肌梗死易误诊，主要原因在于
A．症状不典型或无痛
B．常有呼吸系统疾病
C．心电图不出现病理性Q波
D．血清酶不增高
E．老年人常有胃肠系统疾病
Justin kicked the ball into his own goal. It was _____ his stupid kick that we won the game.
A．because
B．since
C．thanks to
D．according to
