单选题：What is the meaning of "working round the clock"?

题目内容：

What is the meaning of "working round the clock"? A．Repairing clocks.
B．Making clocks.
C．Working with a clock nearby.
D．Working day and night.

参考答案：

答案解析：

回答题：Old Man Myths and Realities1　When does a middle-aged man

回答题：Old Man Myths and Realities1　When does a middle-aged man become an old man

分类：卫生类题型：单选题

We have ample money for the journey.A．some B．little C．extra D．enough

分类：卫生类题型：单选题

As the headmaster made a long speech，the ceremony was prolonged by ten minutes.A

分类：卫生类题型：单选题

The word "its" in the second paragraph refers toA．"the nerve's". B．"the blood's"

分类：卫生类题型：单选题

Paragraph 5________________.A．Effects of a stroke B．Annual cost of stroke in the

分类：卫生类题型：单选题