连续点燃多根导火索时，必须先点信号炮，信号炮导火索长要不得超

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问题单项选择题

连续点燃多根导火索时，必须先点信号炮，信号炮导火索长要不得超过该次被点炮眼中最短导火索长度的（）。

A.1/5

B.1/4

C.1/3

D.1/2

答案

参考答案：C

单项选择题

王先生，40岁，因出血呈休克，经扩容疗法后血压和中心静脉压在正常范围内，但尿18ml/h，尿比重1.010，应提示( )

A．血容量仍不足
B．急性肾衰
C．急性心衰
D．急性肺衰
E．抗利尿激素分泌过多

阅读理解

根据短文内容填空

The old man is already sixty years old. But he has only fifteen birthdays. How is it? When is his birthday?

Keys: His birthday is on February 29th. It's a leap(闰年) year every four years. So he has only fifteen birthdays.

1. The old man is __________ years old.

2. He has only __________ birthdays.

3. His birthday is on __________.

4. A leap year happens(发生) every __________ years.