单项选择题

We can infer that when Harrison succeeded in making his clock he was ______.

A．in his eighties
B．100 years old
C．twenty years old
D．a middle-aged man
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单项选择题
When Harrison's clock was first made,______.
A．it could tell the time at sea
B．it could tell sailors where they were
C．both A and B
D．every country in the world set the time by it besides A and B
单项选择题
In the fifth paragraph, the underlined word it refers to ______.
A．the earth's magnetic field
B．the sun
C．the built-in compass
D．the special way
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