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问题 单项选择题

经济危机周期性的物质基础是( )

A．固定资本更新
B．固定资本使用寿命
C．流动资本更新
D．流动资本使用寿命

答案

参考答案：A

解析：固定资本更新是经济危机周期性的物质基础，所以选A。

单项选择题

The nurse in the emergency department is assessing a 64-year-old client experiencing substernal chest pain. The client’s electrocardiogram shows evidence of myocardial ischemia. Which statement should indicate to the nurse that the client may be a candidate for thrombolytic therapy ？（）

A．"I have had chest pain for 2 days. "

B．"My chest pain started 3 hours ago. "

C．"My chest pain stops when I take a nitroglycerin pill. "

D．"I have had chest pain on and off all week. "
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选择题

My family ________ all at home today.[ ]

A. is

B. am    

C. are

D. be
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